An electric heater of power $3 k W$ is used for $10 h$ . How much energy does it consume? Express you answer in $k W h$ .

0.3 k W h

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3 k W h

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30 W h

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30 k W h

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Solution

The correct option is C $30 k W h$
We know that
$P o w e r = w o r k / t i m e$
$W o r k o r e n e r g y = P o w e r \times t i m e$
$W o r k = 3 k W \times 10 h$
$E n e r g y = 30 k W h$ .

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