ICSE Class 10 Physics 2020 Solved Paper

Question : 3 of 67

Marks: +1, -0

Define a kilowatt hour. How is it related to joule?

Solution:

A kilowatt hour

(1 {\kWh})

is the energy spent (or work done) by a source of power

1 {\kW}

in 1 hour.

1 {\kWh}\;=1 {\kW} × 1 {\hour}

\;=1000 {\Js}^{-1} × 3600 {\ s}

\;=3.6 × 10^6 {\J}

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