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Question

$$1$$ kWh$$=$$ ______________J.

A
$$3.6\times 10^6$$
B
$$36\times 10^6$$
C
$$3.6\times 10^7$$
D
$$3.6\times 10^5$$
Solution
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Correct option is A. $$3.6\times 10^6$$
$$1$$ kilowatt-hour(kWh) is a unit of energy. Normally, we want energy to be expressed in joules(J) and time in seconds(s).
Energy(kWh)$$=$$Power(kW)$$\times$$(h)$$=1000$$W$$\times 3600$$s$$=1000$$J/s$$\times 3600$$s$$=3600000$$J$$=3.6\times 10^6$$J.

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