Chapter 6, Problem 4STP

To determine

To explain: the physical quantity whose unit is kilowatt-hour.

Explanation of Solution

Introduction:

Electrical energy is provided by electric companies that are transformed into mechanical, thermal or other forms of energies for use.

Electrical energy is given by,

$\text{Electrical energy (in kWh) = electrical power (in kW)}\times \text{time (in h)}$

Since electrical energy is a product of electrical power and time, its unit will also be a product of the units of power and time.

Conclusion:

A kilowatt-hour is a unit of electrical energy.