Question

Name the quantity whose unit is (a) kilowatt
(b) kilowatt-hour

Answer 1

Explanation:

The kilowatt hour (symbol commonly kWh, officially but uncommon kW⋅h, kW h) is a unit of energy equal to 3.6 megajoules. If energy is transmitted or used at a constant rate (power) over a period of time, the total energy in kilowatt hours is equal to the power in kilowatts multiplied by the time in hours.

Unit of: Energy

The kilowatt hour is a composite unit of energy with 1 kWh being equivalent to 1 kilowatt (1 kW) of power sustained for 1 hour. One watt is equal to 1 J/s. One kilowatt hour is 3.6 megajoules, which is the amount of energy converted if work is done at an average rate of one thousand watts for one hour.

Answer 2

Kilowatt is the unit of power and kilowatt-hour is the unit of energy.

Explanation:

(a). Power :

Power is equal to the work divided by the time interval.

In mathematically term,

$P=\dfrac{W}{\Delta t}$

Where, W = work

$\Delta t$ = time  interval

The SI unit of power is the watt.

(b). Kilowatt-hour is the unit of energy.

Energy is the amount of work done.

Hence, Kilowatt is the unit of power and kilowatt-hour is the unit of energy.

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Topic ; power

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