Electric Power is defined as the product of voltage and current. This post illustrates the SI unit of electrical power.

SI unit of electric power is:

  1. volt (V)
  2. amps (A)
  3. watt (W)
  4. joule (J)

Correct answer: 3. watt


From Basic Electrical and Electronics Engineering topics we know about voltage and current:

  • Voltage: Unit is volts
  • Current: Unit is amps

Joule is the basic unit for energy

The SI unit of power is watt which is correct answer in present case.

So 3. watt (W) is the correct answer.