Find the cost of operating an electric toaster for $2 h r s$ , if it draws a current of $8 A$ on a $110 V$ circuit. The cost of electric energy is $R s 2.5 / k W h$ .

R s 4.40

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R s 6

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R s 8.20

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R s 2.20

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Solution

The correct option is A $R s 4.40$
Given: Current = $8 A$ , $V = 110 v o l t$ , $t = 2 h r s$
Power, $P = V I = 8 \times 110 = 880 W = 0.880 k W$
Energy consumed, $E = P t = 880 \times 2 = 1.760 k W h$
Cost $C = 1.760 \times 2.5 = R s 4.4$

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