Kilowatt is the unit of electrical but kilowatt hour is the unit of electrical

Explanation:-

In the SI system, the unit of power is Watt (W). 

Kilowatt is equal to one thousand (10³ ) watts. 

The kilowatt-hour is a unit of energy and is equal to 1,000 watt-hours.

 If the energy is being transmitted or used at a constant rate (power) over a period of time, the total energy in kilowatt-hours is the product of the power in kilowatts and the time in hours.

Final answer:-

Hence,the correct option is (A) i.e. power, energy.