Ak-Sar-Ben Amateur Radio Club © Ohm's Law Calculator

Ohm’s Law is a set of formulas used in electronics to calculate an unknown amount of current, voltage or reistance. It was named after the German physicist Georg Simon Ohm. Ohm's law is important in learning the basics of electronic theory required to get your amateur radio license.

Ohms Law is used to calculate a missing value in a circuit. Using the figure below you can easily remember the 3 basic formulas for Ohm's Law.
The values in the formulas are as follows: E=Voltage I=Current R=Resistance

Just cover the value you need to find, then multiply or divide the others as the figure shows. E=I*R or I=E/R or R=V/I.
Use the calculator below to verify your calculations.

Type in the
Current

Amps (I)

Type in the
Resistance

Ohms (R)

This is the
Voltage

Volts (E)

Type in the
Voltage

Volts (E)

Type in the
Resistance

Ohms (R)

This is the
Current

Amps (I)

Type in the
Voltage

Volts (E)

Type in the
Current

Amps (I)

This is the
Resistance

Ohms (R)