Battery Voltage Calculator

Updated on February 12, 2026 | Added in Physics

Battery Voltage Calculation

Battery voltage can be calculated using Ohm's Law, which relates voltage, current, and resistance in electrical circuits.

[V = I \times R]

Where:

If a battery has a current of 120 A flowing through it and an internal resistance of 2.5 Ω:

[V = 120\ \mathrm{A} \times 2.5\ \Omega = 300\ \mathrm{V}]

The battery voltage would be 300 volts.

This calculator determines the voltage of a battery using the current and resistance values according to Ohm's Law.

The calculation uses the formula: Voltage = Current × Resistance. For example, 120 A × 2.5 Ω = 300 V.

Use this calculator when you need to determine battery voltage from measured current and resistance values in electrical systems.

This calculator assumes ideal conditions and uses Ohm's Law for linear resistances. Real batteries may have non-linear characteristics.