A geyser is rated 1500 W, 250 V. This geyser is connected to 250 V mains. The cost of energy consumed at Rs. 4.20 per kWh for 5 hours will be :

R s . 250

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R s . 30

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R s . 31

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R s . 31.5

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Solution

The correct option is C $R s . 31.5$
Given:
The power of the geyser $P = 1500 W$
Hence, the energy consumed by the geyser in 5 hours is $1500 \times 5 = 7500 W = 7.5 k W$
The cost of energy consumed per kWh is given as Rs. 4.20.
the electric bill for 5 hours of operation of the geyser is $4.20 \times 7.5 k W h = R s .31 .5$

Hence, the total cost is Rs. 31.5.

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