Question

A house is fitted with 20 lamps each of 60 W, 10 fans consuming 0.5A each and an electric kettle of resistance 110Ω. If the energy is supplied at 220V and costs 25paise per KWh, calculate the bill for 30 days for running each appliance for 6 hours a day.

Answer 1

Answer:

Explanation:

Power of 4 lamps each 100W =4X100W=400W=0.4kw

Power consumed by 2 fans = 2(200x1/2)=200w

Total power consumed =400w+200w=600w=0.6kw

Total time=5hrs x 30days=150hrs

Total energy consumed=p.t= 0.6kw x 150

                                                    =90kw or units

month bill=90kw x 3=rs.270