Question

Electric bulb is rated as 50w and 220v. calculate the energy in 40 mins?

Answer 1

P= 50w and t = 40 min =40/60h
E = P* t
= 50w * 40/60 h
= 100/3 Wh
= 33.3333Wh
= 33.3333/1000 kwh
= 0.3333 kwh
= 0.334 kwh (approx.)