Question

A house has 3 tube lights, two fans and a Television. Each tube light draws 40W. The fan draws80W and the Television draws 60W. On the average, all the tube lights are kept on for fivehours, two fans for 12 hours and the television for five hours every day. Find the cost of electricenergy used in 30 days at the rate of Rs. 3.oo per Kwh.

Answer 1

Answer:

The answer is 253.8 rupee.

Explanation:

Refer to the pic.

Answer 2

each tube light draws 40W,

so,total power consumption due to tube lights = 3 × 40 = 120W

energy consumed due to tube lights = 120W × 5hrs = 600 Watt.hr

The fan draws 80W ,

so, total power consumption due to fans = 2 × 80W = 160W

energy consumed due to fans = 160W × 12 hrs = 1920 watt.hr

and power consumption due to television = 60W

energy consumed due to television = 60W × 5hrs = 300 watt.hr

so, total energy consumed per day = 600 + 1920 + 300 = 2820 watt.hr

so, energy consumed per month = 30 × 2820 Watt.hr

= 84600 watt.hr

now cost of electricity = energy consumption per month × rate per kWh

= 84600 Wh × 3Rs/kWh

= 84.6 KWh × 3Rs/Kwh

= 253.8 Rs.