Question

A bulb of power 40 w is used for 12.5 h each day for 30 days . Calculate the electrical energy consumed.

Answer 1

total hours=12.5×30=375 hours
power =40w=0.04kw
electrical energy=power×time=0.04×375=15kwh=15units

Answer 2

Electrical energy consumed ;
given:
power=40w
time=12.5h*30 days
E=VIT
so E=P*t
since P=V*I
so E=40/1000*12.5*30
0.04*12.5*30
E=15kwj
Hope it helps u mate