Unit of electric power may also be expressed as:

Volt-ampere Kilowatt-hour Watt second Joule second

Volt-ampere

The unit of potential difference is volts and is denoted by V. The unit of current is ampere and is denoted by A. Since power is the product of potential difference and current, i.e; Power (P) = Potential Difference ×Current = VI, the unit of electric power may be expressed as volt ampere.