Enter the voltage and current of an electrical system into the calculator to determine the power using watt’s law.

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## Watt’s Law Formula

The following formula is used to calculate the power using Watt’s law.

P = V * I

- Where P is the power (watts)
- V is the voltage (Volts)
- I is the current (amps)

## Watt’s Law Definition

Watt’s law describes the relationship between power, voltage, and current. This law states that power is equal to the product of voltage and current.

## Watt’s Law Example

How to calculate power using watt’s law?

**First, determine the voltage.**Measure the total voltage of the circuit.

**Next, determine the current.**Measure the current of the circuit.

**Finally, calculate the power.**Using watt’s law calculate the electrical power.

## FAQ

**What is watt’s law?**

Watt’s law is a law of electro-magnetism that states that the power of a circuit is equal to the product of the voltage and current.