One kilowatt hour is equal to

[amp_mcq option1=”36 × 10³ joule” option2=”36 × 10⁵ joule” option3=”10³ joule” option4=”10⁵ joule” correct=”option2″]

This question was previously asked in

UPSC NDA-2 – 2016

One kilowatt hour (kWh) is a unit of energy. It is the energy consumed by a 1 kilowatt (kW) power device operating for 1 hour (h).

1 kilowatt (kW) = 1000 watts (W) = 1000 joules per second (J/s).
1 hour (h) = 60 minutes × 60 seconds = 3600 seconds (s).

Therefore, 1 kWh = 1 kW × 1 h = (1000 J/s) × (3600 s) = 3,600,000 J.
In scientific notation, this is $3.6 \times 10^6$ J, which is equal to $36 \times 10^5$ J.

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