Question

A house is fitted with 10 tubes each of 40 W. If all tubes are lighted for 10 hours and if

the cost of one unit of electricity energy is Rs. 2.50 the total cost of electricity
consumption is a) Rs. b) Rs. 20 c) Rs. 25 d) Rs. 10​

Answer 1

Answer:

The total cost of electricity consumption, in given question will be - Rs. 10

Given - 1 bulb consumes - 40 W

10 bulb will consume - 400 W

Hence, total power consumed by all the bulbs in house is 400W.

Now, electricity consumed is calculated by the product of amount of power consumed and time.

Time given - 10 hours

Therefore total electricity consumed - 400*10

Electricity consumed - 4000Wh = 4KWh.

1 unit of electricity is "the amount of electrical energy consumed by a load of 1 kW power rating in 1 hour."

Since, 1 unit costs Rs. 2.50

4 unit will cost - 2.50*4 = 10

Therefore, cost of lighting 10 tubes of 40W each for 10 hours will be Rs 10

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