Question

The kilowatt hour is the unit of ___________

Answer 1

Hint: When we define the power as energy per unit time and in the international system of units (SI), it is joule per second. Kilowatt is the unit of the power and using the relation between power and energy we will see that the kilowatt hour is the unit of energy.

Complete step-by-step solution -
And thus energy consumed = power dissipated × time of dissipation.
Also since the SI unit of power is watt.
Therefore it comes as energy consumed = watt-sec
But in our day to day life energies are consumed in large amounts and for many hours so using watt - sec gives a very large number so making it smaller we take power in kilo and time in hour unit thus becomes kilowatt- hour.
Hence the kilowatt hour is the unit of energy.

Additional Information-
Power is defined as the rate of change of work per unit time. The S.I. unit of power is joules per second. The other unit of power is watt which is named after the scientist James watt. The other commonly used unit of power is horsepower which is used for engines, air conditioners. One horsepower is equal to 746 watt.
Energy- The capacity of doing work is called energy. The S.I. unit of energy is joules.
The law of conservation of energy states that the energy can neither be created nor be destroyed but it can be transferred from one form to another.

Note: A kilowatt hour is the measure of energy which is equal to the amount of energy spent when a one kilowatt appliance is used for one hour. Our electricity bill is also calculated in watt hour because we consume electricity almost 24×7. And even all problems related to the generation, distribution of electricity are conquered in kilowatt-hour or even megawatt-hour.