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Q.

Which of the following is equivalent to one kilowatt hour?

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a

36 \times 10^{6} J

b

3.6 \times 10 ⁶ J

c

36 \times 10 ⁻⁵ J

d

0.36 \times 10 ⁶ J

answer is B.

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Detailed Solution

One kilowatt hour is equivalent to

3.6 \times 10^{6} J

.
It is known that

1 kW = 1000 W

and,

1 hour = 3600 s

Also,

\Rightarrow 1 kWh = 1000 Wh

Hence,

\Rightarrow 1000 Wh = 1000 \times 3600 J

\Rightarrow 1 kWh = 3600000 J

Therefore,

1 kWh = 3.6 \times 10^{6} J .

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