# Ohm’s Law Calculator

Calculate the voltage, resistance or current of a circuit or component with the Ohm’s Law Calculator and learn on the go with the integrated live example

The formula to calculate voltage is:

$V=IR$

The formula to calculate resistance is:

$R=\frac{V}{I}$

The formula to calculate current is:

$I=\frac{V}{R}$

Where
V = Voltage in volts
R = Resistance in ohms
I = Current in amperes

Example 1: Find the voltage across a component when the current is 2.6 amperes and the resistance is 50 ohms

$V=2.6\times 50=130\; volts$

Example 2: Find the resistance of a component when the voltage is 30 volts and the current is 1.3 amperes

$R=\frac{30}{1.3}=23\; ohms$

Example 3: Find the current through a component when the voltage is 12 volts and the resistance is 15 ohms

$I=\frac{12}{15}=0.8\; amperes$

### Using the Ohm’s Law Calculator

Select the value that you want to calculate

Selecting units: You can choose your preferred units of measurement through selecting the units cells and clicking the downwards pointing arrow to display a list of available options

Learn As You Go: This feature displays a live example of how to perform the selected calculation using the figures that you enter

Enter the Resistance and Current

## How To Calculate Ohm’s Law

Enter some values to get started!

Reference: ARRL – The Radio Amateur’s Handbook