Ohm's Law
Ohm's Law
Ohm's Law Diagram
The following diagram shows the relationship between the various electrical properties.
Voltage V
Voltage is measured in volts. (V)
Current I
Current is measures in amps (A). Current is often measured in many electronic circuits is measured in milliamps (ma). A milliamp is one thousandth of an amp (0.01A).
Resistance R
Resistance is measured in ohms (Ω).
Power P
Power is measures in watts (W).
LED Calculator
Use these calculators to calculate the resistor needed to include in a circuit with a LED.
Single LED
LED Calculator for 1 LED.
Array of LEDs
LED Calculator for an array of LEDs.