Question

If 2bulbs and 3fans and 1engin each have power rating of 2kw. If all these appiances start to wark 9am to 12pm and after that machine is switched off and bulbs and fan continue to wark till 4pm ,then find the conserve energy by these applicences

Answer 1

2 bulbs + 3 fans + 1 engine = 6 electrical appliances

power rating 2 kw

time - 9am to 12am = 3hrs    

9am to 4pm = 7hrs

Machine switched off...

Hence

2 bulbs = 2 + 2 = 4kw

3 Fans = 2 + 2 + 2 = 6kw

6kw + 4kw = 10kw

Conserve Energy

12pm to 4pm = 2 + 2 + 2 + 2 = 8kw