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

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)

To calculate power using watt’s law, multiply the voltage by the current.

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?

  1. First, determine the voltage.

    Measure the total voltage of the circuit.

  2. Next, determine the current.

    Measure the current of the circuit.

  3. Finally, calculate the power.

    Using watt’s law calculate the electrical power.


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.