Voltage Calculator

Enter the current (I) and the resistance (R) of a system to calculate the voltage running across a conductor. The equation is based on Ohm’s Law.

Voltage Formula:

Voltage (V) = I (Current) * R (Resistance)

Voltage is known as the electric potential difference between two points. The Si unit for voltage is volts. The difference in electrical potential is often times caused by electric charge, electric current, or magnetic fields. Sometimes, it’s decided by all three of those parameters.

To measure voltage a voltmeter is used. This is connected to two opposite points along a device, and the voltage drop across the device is known as the difference. When using one of these reference points as ground, it provides the total voltage at that point.