Question

23. A house has 3 tube lights, two fans and a Television.
Each tube light draws 40W. The fan draws 80W and
the Television draws 60W. On the average, all the
tube lights are kept on for five hours, two fans for 12
hours and the television for five hours every day. Find
the cost of electric energy used in 30 days at the rate
of Rs. 3.00 per Kwh. (AS7)​

Answer 1

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Answer 2

Explanation:

For each tube light, power, P = 40/1000 W

So, the energy consumed by the fan in a day is

➲ u = P x t

➲ u = (40/1000)kW x (5)h

➲ u = 200/1000

➲ u = 0.2kWh

Energy consumed by the fan in a day is

➲ u = P x t

➲ u = (80)W x (12)h

➲ u = (80 W)x(12 h)

➲u = 960/1000

➲u = 0.96 kWh.

Total energy consumed by TV in a day is

➲ u = P x t

➲ u = (60)W x (8)h

➲ u = 480/1000

➲ u = 0.48kWh

Total energy consumed in a day

➲ 2 x 0.2 kWh + 0.96 kWh + 048 kWh

➲ 1.84 kWh

Energy consumed in a month is

➲ (1.84 kWh) x 30

➲ 55.2 kWh.

The cost of electricity-

➲ Rs (55.2 x 3)

➲ Rs 165.6

Therefore:-

The cost of electricity used in the month is 165.6 rupees.