Question

how much time will a bulb of 100 watt consume an energy of 2 kwh

Answer 1

E = p*t
2 = 100*t
2/t = 100
t = 100*2
t = 200 sec.
so it will take 200 seconds..

Answer 2

E = p/h
2=100
2*100=t
200=t
so it take 200 seconds