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.
1 tube light consume power = 40 W
So 3 tube lights will consume = 3 x 40 = 120 W
They are kept on for 5 hours so energy consumed = 120 x 5 = 600 Wh
1 fan consume power = 80 W
2 fans will consume = 80 x 2 = 160 W
They work for 12 hours, so energy consumed = 160 × 12 = 1920 Wh
Television consumes power = 60 W
It works for 5 hours, so energy consumed = 60 x 5 = 300 Wh
Total energy consumed in 1 day = 600 + 1920 + 300 = 2820 Wh = 2.820 Kwh
Consumption for energy in 30 days = 30 x 2.820 KWh
Cost is Rs 3 for 1 kWh
So total amount = 3 x 30 x 2.820 = Rs 253.80
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