An electric heater is used on a $220 V$ supply and takes a current $5 A$ . What is the cost of using the heater for 1 hour, if $1 k W h$ cost 1 rupee.

55 p

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R s . 2.6

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R s . 1.1

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R s . 2.2

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Solution

The correct option is C $R s . 1.1$
Electric energy $= V \times I \times t = 220 V \times 5 A \times 1 h = 1.1 k W h$
Cost of $1 k W h = R s . 1$
Cost of $1.1 k W h = R s . 1.1$

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