Question

An electric bulb of 100watt works for 4hr a day. Calculate the units of energy consumed in 15 days.

Answer 1

Power = 100 w = 0.1 kw

Time = 4 * 15 = 60 hours

Energy consumed = Power ×Time

= 0.1 × 60

= 6 Kwh

Answer 2

given:
p= 0.1 kw
Time = 4 Hours
Energy consumed=p ×t

Energy consumed= 0.1 × 4=0.4 kwh(units)
energy consumed in 15 days= 15* 0.4=6kwh(units)
hence energy comsumed in 15days is 6 kwh or 6 units