Question

. A house has 3 tube lights, two fans and a Television. Each tube light dram 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 television for five hours every day. Find the cost of electric energy 30 days at the rate of Rs.300 per KWH.(AS-7) used​

Answer 1

Answer:

Explanation:

Total power used by tubelights = 3 x 40 w= 120 w

Total power used by fans = 2 x 80w =160 w

In a single day,

Energy consumed by tubelights = 120 w x 5 h = 600 wh = 0.6kwh

Energy consumed by fans = 160w x 12 h = 1920 wh = 1.92 kwh

Energy consumed by television =  60 w x 5 h = 300 wh = 0.3 kwh

For 30 days

Tubelight = 30 x 0.6 kwh = 18 kwh

fans = 30 x 1.92 kwh= 57.6 kwh

TV = 30 x 0.3 kwh = 9 kwh

Total energy consumption = 18+57.6+9 kwh = 84.6 kwh

Electric bill = Rs. 300 x 84.6 = Rs. 25380