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Question

An electric heater is rated $1500 W$ . How much energy does it use in $10$ hours?
$10 k W h$
$20 k W h$
$15 k W h$
$25 k W h$

A

20 k W h

B

25 k W h

C

15 k W h

D

10 k W h

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Solution

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Energy consumed can be obtained as $P = \frac{W}{t}$
$P =$ Power rating of heater $= 1.5 k W$
$t =$ time for heater is operated $= 10$ hour
$W = P \times t = 15 \times 10 = 15 k W h$

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