CBSE Class 10 Science 2019 · Paper 31/3/3 · Question 1

Electricity 1 mark Easy

Define 1 kilowatt hour.

Answer

One kilowatt hour is the energy used by a 1 kW appliance in 1 hour, equal to $3.6 \times 1 0^{6}$ J.

One kilowatt hour (1 kW h) is the electrical energy consumed when an appliance of power

1

kW (

1000

W) is used for

1

hour. It is the commercial unit of electrical energy:

1 kW h = 1000 W \times 3600 s = 3.6 \times 1 0^{6}

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