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Ohm's Law - Revision history
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Jklingert: /* Ohm's Law */
2013-08-22T17:45:06Z
<p><span dir="auto"><span class="autocomment">Ohm's Law</span></span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 17:45, 22 August 2013</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Ohm's Law==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Ohm's Law==</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>[http://en.wikipedia.org/wiki/Ohm's_law Ohm's Law] is a formula that relates the basic electrical properties of [[Ohm%27s_Law#Voltage_.28V.29|Voltage]], [[Ohm%27s_Law#Current_.28I.29|Current]] and [[Ohm%27s_Law#Resistance_.28R.29|Resistance]]. These properties can be measured with a [http://en.wikipedia.org/wiki/Multimeter multimeter].[[File:Multimeter.jpg|100px]]<br/></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>[http://en.wikipedia.org/wiki/Ohm's_law Ohm's Law] is a formula that relates the basic electrical properties of [[Ohm%27s_Law#Voltage_.28V.29|Voltage]], [[Ohm%27s_Law#Current_.28I.29|Current]] and [[Ohm%27s_Law#Resistance_.28R.29|Resistance]]. These properties can be measured with a [http://en.wikipedia.org/wiki/Multimeter multimeter].<ins style="font-weight: bold; text-decoration: none;"><br/> [https://learn.sparkfun.com/tutorials/how-to-use-a-multimeter How to use a multimeter]<br/> </ins>[[File:Multimeter.jpg|100px]]<br/></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The common formula for Ohm's Law is:<br/></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The common formula for Ohm's Law is:<br/></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>:::'''<big>V=IR</big>'''<br/></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>:::'''<big>V=IR</big>'''<br/></div></td></tr>
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Jklingert
http://www.doityourselfchristmas.com/wiki/index.php?title=Ohm%27s_Law&diff=11024&oldid=prev
Jklingert: /* Disclaimers */
2013-08-05T12:35:09Z
<p><span dir="auto"><span class="autocomment">Disclaimers</span></span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 12:35, 5 August 2013</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The standard disclaimers pertaining to the information contained on this wiki page are listed [[Disclaimers | here.]]<br/></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The standard disclaimers pertaining to the information contained on this wiki page are listed [[Disclaimers | here.]]<br/></div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">'''THIS PAGE IS UNDER CONSTRUCTION AND IS NOT COMPLETE AND HAS NOT BEEN CHECKED FOR ERRORS YET!!'''<br/></del></div></td><td colspan="2" class="diff-side-added"></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Ohm's Law==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Ohm's Law==</div></td></tr>
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Jklingert
http://www.doityourselfchristmas.com/wiki/index.php?title=Ohm%27s_Law&diff=10568&oldid=prev
Jklingert: /* LED Resistor Example */
2013-06-27T19:48:56Z
<p><span dir="auto"><span class="autocomment">LED Resistor Example</span></span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 19:48, 27 June 2013</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===LED Resistor Example===</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===LED Resistor Example===</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>#What resistor would you use with a 5VDC power supply and a Blue 5mm LED with a V<sub>F</sub> of 3.0V?<br/> First you need to calculate the voltage that the resistor needs to drop. That is equal to <br/>V<sub>Drop</sub>=V<sub>PowerSupply</sub> - V<sub>F</sub>=5-3=2V<br/>The table above <del style="font-weight: bold; text-decoration: none;">recomends </del>a current I of 20 ma for a 5mm LED. The formula for resistance gives us:<br/>R=V/I=2/0.02=100&Omega; Generally you choose a resistor for that value or the next higher standard resistor value.<br/> To calculate the wattage resistor needed you use the formula for Power:<br/>P=VI=(2)(0.02)= 0.04W. You would use the next standard size up resistor, 1/8 W.<br/></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>#What resistor would you use with a 5VDC power supply and a Blue 5mm LED with a V<sub>F</sub> of 3.0V?<br/> First you need to calculate the voltage that the resistor needs to drop. That is equal to <br/>V<sub>Drop</sub>=V<sub>PowerSupply</sub> - V<sub>F</sub>=5-3=2V<br/>The table above <ins style="font-weight: bold; text-decoration: none;">recommends </ins>a current I of 20 ma for a 5mm LED. The formula for resistance gives us:<br/>R=V/I=2/0.02=100&Omega; Generally you choose a resistor for that value or the next higher standard resistor value.<br/> To calculate the wattage resistor needed you use the formula for Power:<br/>P=VI=(2)(0.02)= 0.04W. You would use the next standard size up resistor, 1/8 W.<br/></div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>#What resistor would you use with a 5VDC power supply and an optoisolator with a V<sub>F</sub> of 1.2V?<br/> First you need to calculate the voltage that the resistor needs to drop. That is equal to <br/>V<sub>Drop</sub>=V<sub>PowerSupply</sub> - V<sub>F</sub>=5-1.2=3.8V<br/>The table above <del style="font-weight: bold; text-decoration: none;">recomends </del>a current I of 6 ma for an optoisolator. The formula for resistance gives us:<br/>R=V/I=3.8/0.006=633&Omega; Generally you choose a resistor for that value or the next higher standard resistor value, 680&Omega;.<br/> To calculate the wattage resistor needed you use the formula for Power:<br/>P=VI=(3.8)(0.006)= 0.02W. You would use the next standard size up resistor, 1/8 W.<br/></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>#What resistor would you use with a 5VDC power supply and an optoisolator with a V<sub>F</sub> of 1.2V?<br/> First you need to calculate the voltage that the resistor needs to drop. That is equal to <br/>V<sub>Drop</sub>=V<sub>PowerSupply</sub> - V<sub>F</sub>=5-1.2=3.8V<br/>The table above <ins style="font-weight: bold; text-decoration: none;">recommends </ins>a current I of 6 ma for an optoisolator. The formula for resistance gives us:<br/>R=V/I=3.8/0.006=633&Omega; Generally you choose a resistor for that value or the next higher standard resistor value, 680&Omega;.<br/> To calculate the wattage resistor needed you use the formula for Power:<br/>P=VI=(3.8)(0.006)= 0.02W. You would use the next standard size up resistor, 1/8 W.<br/></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===Single LED Calculator===</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===Single LED Calculator===</div></td></tr>
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Jklingert
http://www.doityourselfchristmas.com/wiki/index.php?title=Ohm%27s_Law&diff=10519&oldid=prev
Jklingert: /* Voltage Drop Example */
2013-06-25T04:21:58Z
<p><span dir="auto"><span class="autocomment">Voltage Drop Example</span></span></p>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===Voltage Drop Example===</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===Voltage Drop Example===</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div># What is the voltage drop when using 5V and drawing 500ma over a 10M pair of Cat5 wire?<br/>Since Cat5 wire has a loop resistance of about 0.19 &Omega;/M, the 10 M length will have a resistance of (10)(0.19)=1.9 &Omega;<br/> By Ohm's Law we know that V=IR, then<br/>V=IR=(0.5)(1.9)=0.95 V drop, so only 4.05 V will be at the far end of the wire.<br/></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div># What is the voltage drop when using 5V and drawing 500ma over a 10M pair of Cat5 wire?<br/>Since Cat5 wire has a loop resistance of about 0.19 &Omega;/M, the 10 M length will have a resistance of (10)(0.19)=1.9 &Omega;<br/> By Ohm's Law we know that V=IR, then<br/>V=IR=(0.5)(1.9)=0.95 V drop, so only 4.05 V will be at the far end of the wire.<br/></div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">#What is the voltage drop when using 5V and drawing 30A over a 2ft length of 18ga wire?<br/> Since 18 ga wire has a loop resistance of about 0.013 &Omega;/ft, the 2ft wire will have a resistance of (2)(0.012) = 0.024 &Omega;<br/> By Ohm's Law we know that V=IR, then<br/>V=IR=(30)(0.024)=0.72 V drop, so only 4.28 V will be at the far end of the wire. The wire will get hot because it is dissipating P=VI=(0.72)(30)= 21W! You must use larger wire for high currents!<br/></ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>This is a [http://doityourselfchristmas.com/forums/showthread.php?20242-New-tools-for-estimating-pixels-string-voltage-drops thread] that discusses voltage drop.<br/></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>This is a [http://doityourselfchristmas.com/forums/showthread.php?20242-New-tools-for-estimating-pixels-string-voltage-drops thread] that discusses voltage drop.<br/></div></td></tr>
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Jklingert
http://www.doityourselfchristmas.com/wiki/index.php?title=Ohm%27s_Law&diff=10518&oldid=prev
Jklingert: /* Current Examples */
2013-06-25T04:04:36Z
<p><span dir="auto"><span class="autocomment">Current Examples</span></span></p>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>#How much current is used by a 75W floodlight using 120V?<br/>I=P/V, I=75/120=0.625A</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>#How much current is used by a 75W floodlight using 120V?<br/>I=P/V, I=75/120=0.625A</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>#What is the current thru a 5W lamp with a resistance of 2 &Omega;?<br/>V=&radic;<span style="text-decoration: overline">P</span>/R=&radic;<span style="text-decoration: overline">(5)</span>/2=2.24/2=1.12A</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>#What is the current thru a 5W lamp with a resistance of 2 &Omega;?<br/>V=&radic;<span style="text-decoration: overline">P</span>/R=&radic;<span style="text-decoration: overline">(5)</span>/2=2.24/2=1.12A</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">#How much current is required by 1 RGB pixel that draws 20ma (0.02A) each per color?<br/>I<sub>Parallel</sub>= I<sub>1</sub>+I<sub>2</sub>+I<sub>3</sub>=0.02+0.02+0.02=0.06A, or 60mma</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">#How much current is required by 4 RGB pixels that draw 60ma (0.06A) each when lit white?<br/>I<sub>Parallel</sub>= I<sub>1</sub>+I<sub>2</sub>+I<sub>3</sub>+I<sub>4</sub>=0.06+0.06+0.06+0.06=0.24A, or 240 ma</ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Resistance '''(R)'''==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Resistance '''(R)'''==</div></td></tr>
</table>
Jklingert
http://www.doityourselfchristmas.com/wiki/index.php?title=Ohm%27s_Law&diff=10517&oldid=prev
Jklingert: /* Current Formulas */
2013-06-25T03:58:57Z
<p><span dir="auto"><span class="autocomment">Current Formulas</span></span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 03:58, 25 June 2013</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>*'''I=P/V'''</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>*'''I=P/V'''</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>*'''I=&radic;<span style="text-decoration: overline">P</span>/R'''</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>*'''I=&radic;<span style="text-decoration: overline">P</span>/R'''</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">*'''I<sub>Parallel</sub>= I<sub>1</sub>+I<sub>2</sub>+I<sub>3</sub>+...I<sub>n</sub>'''</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===Current Examples===</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===Current Examples===</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>#How much current flows thru a 680 &Omega; resistor that has 5V applied to it?<br/>I=V/R, I=5/680=0.007A (7 ma)</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>#How much current flows thru a 680 &Omega; resistor that has 5V applied to it?<br/>I=V/R, I=5/680=0.007A (7 ma)</div></td></tr>
</table>
Jklingert
http://www.doityourselfchristmas.com/wiki/index.php?title=Ohm%27s_Law&diff=8344&oldid=prev
Jklingert: /* Voltage Drop Example */
2013-01-26T00:09:54Z
<p><span dir="auto"><span class="autocomment">Voltage Drop Example</span></span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 00:09, 26 January 2013</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[[Category:Beginners Info]]</ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:DIYC Index]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:DIYC Index]]</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:General Info]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:General Info]]</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Pixel]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Pixel]]</div></td></tr>
</table>
Jklingert
http://www.doityourselfchristmas.com/wiki/index.php?title=Ohm%27s_Law&diff=7728&oldid=prev
Jklingert: /* Voltage Drop Example */
2012-11-26T16:11:05Z
<p><span dir="auto"><span class="autocomment">Voltage Drop Example</span></span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 16:11, 26 November 2012</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:General Info]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:General Info]]</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[[Category:Pixel]]</ins></div></td></tr>
</table>
Jklingert
http://www.doityourselfchristmas.com/wiki/index.php?title=Ohm%27s_Law&diff=7721&oldid=prev
Jklingert: /* LED Resistor Example */
2012-11-20T02:35:15Z
<p><span dir="auto"><span class="autocomment">LED Resistor Example</span></span></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 02:35, 20 November 2012</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===LED Resistor Example===</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===LED Resistor Example===</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>#What resistor would you use with a 5VDC power supply and a Blue 5mm LED with a V<sub>F</sub> of 3.0V?<br/> First you need to calculate the voltage that the resistor needs to drop. That is equal to <br/>V<sub>Drop</sub>=V<sub>PowerSupply</sub> - V<sub>F</sub>=5-3=2V<br/>The table above recomends a current I of 20 ma for a 5mm LED. The formula for resistance gives us:<br/>R=V/I=2/0.02=100&Omega; Generally you choose a resistor for that value or the next higher standard resistor value.<br/> To calculate the wattage resistor needed you use the formula for Power:<br/>P=VI=(2)(0.02)= 0.04W. You would use the next standard size up resistor, 1/8 W.<br/></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>#What resistor would you use with a 5VDC power supply and a Blue 5mm LED with a V<sub>F</sub> of 3.0V?<br/> First you need to calculate the voltage that the resistor needs to drop. That is equal to <br/>V<sub>Drop</sub>=V<sub>PowerSupply</sub> - V<sub>F</sub>=5-3=2V<br/>The table above recomends a current I of 20 ma for a 5mm LED. The formula for resistance gives us:<br/>R=V/I=2/0.02=100&Omega; Generally you choose a resistor for that value or the next higher standard resistor value.<br/> To calculate the wattage resistor needed you use the formula for Power:<br/>P=VI=(2)(0.02)= 0.04W. You would use the next standard size up resistor, 1/8 W.<br/></div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">#What resistor would you use with a 5VDC power supply and an optoisolator with a V<sub>F</sub> of 1.2V?<br/> First you need to calculate the voltage that the resistor needs to drop. That is equal to <br/>V<sub>Drop</sub>=V<sub>PowerSupply</sub> - V<sub>F</sub>=5-1.2=3.8V<br/>The table above recomends a current I of 6 ma for an optoisolator. The formula for resistance gives us:<br/>R=V/I=3.8/0.006=633&Omega; Generally you choose a resistor for that value or the next higher standard resistor value, 680&Omega;.<br/> To calculate the wattage resistor needed you use the formula for Power:<br/>P=VI=(3.8)(0.006)= 0.02W. You would use the next standard size up resistor, 1/8 W.<br/></ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===Single LED Calculator===</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===Single LED Calculator===</div></td></tr>
</table>
Jklingert
http://www.doityourselfchristmas.com/wiki/index.php?title=Ohm%27s_Law&diff=7720&oldid=prev
Jklingert: /* LED Resistor Calculator */
2012-11-19T03:51:33Z
<p><span dir="auto"><span class="autocomment">LED Resistor Calculator</span></span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 03:51, 19 November 2012</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><table border="1"></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><table border="1"></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><tr><td>LED Color</td><td> Typical V<sub>F</sub></td></tr></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><tr><td>LED Color</td><td> Typical V<sub>F</sub></td></tr></div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><tr><td>Optoisolator</td><td>1.<del style="font-weight: bold; text-decoration: none;">25 </del>V</td></tr></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><tr><td>Optoisolator</td><td>1.<ins style="font-weight: bold; text-decoration: none;">2-1.6 </ins>V</td></tr></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><tr><td>Red</td><td>1.9-2.3 V</td></tr></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><tr><td>Red</td><td>1.9-2.3 V</td></tr></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><tr><td>Green</td><td>2.9-3.5 V</td></tr></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><tr><td>Green</td><td>2.9-3.5 V</td></tr></div></td></tr>
</table>
Jklingert