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Q.

In a house there are four bulbs each of 50W and 5 fans each of 60W. If they are used at the rate of 6 hours a day, the electrical energy consumed in a month of 30 days is ----- units

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answer is 90.

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Detailed Solution

Given four bulbs each of 50W and 5 fans each of 60W.

Total power is

$P = 4 \times 50 + 5 \times 60 = 500 W$

Units consumed per day = $\frac{500 W \times 6 H o u r s}{1000} = 3 K W H o r 3 u n i t s$

So for 30 days, total energy is 90units

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