Unit of electric power may also be expressed as:A. Volt ampereB. Kilowatt hourC. Watt secondD. Joule second

The correct answer is B. Kilowatt hour.

The unit of electric power is typically expressed in watts (W). However, when considering the energy consumed or produced over a period of time, the unit used is the kilowatt hour (kWh).

One kilowatt hour is equal to the energy consumed or produced when a device with a power rating of one kilowatt (1000 watts) operates for one hour. It is commonly used to measure electricity usage in homes and businesses.

Option A, volt ampere (VA), is a unit used to measure apparent power in an alternating current (AC) electrical system.

Option C, watt second (Ws), is a unit of energy equal to one watt of power expended or produced for one second.

Option D, joule second (Js), is not commonly used as a unit of electric power. The joule (J) is a unit of energy, and multiplying it by time (seconds) gives the unit of energy multiplied by time, not power.