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An electric iron draws a current of 15A from a 220 V supply. What is the cost of using iron for 30 min everyday for 15 days if the cost of unit $(unit = 1 kwhr)$ is 2 rupees

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Rs. 49.5

Rs. 60

Rs. 40

Rs. 10

answer is A.

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Detailed Solution

i = 15 A,  V = 220 v

$t = 30 \min = 1 / 2 hr for 15 days$

$P = V \times I$

$W = P \times t = 220 \times 15 = 3300W \times 1 / 2 \times 15$

$= 24.75 kwh$

$cost of 1 kwh = 2 R_{S} = 24.75 \times 2 = 49.5 Rs$

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