Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?

Energy consumed by an electrical appliance is given by the expression,H= Pt

Where, Power of the appliance = P
Time = t

Energy consumed by a TV set of power 250 W in 1 h
= 250 ×3600 = 9 ×105 J

Energy consumed by a toaster of power 1200 W in 10 minutes
= 1200 ×600

Energy consumed by a toaster of power 1200 W in 10 minutes
= 1200 ×600 = 7.2×105 J

Therefore, the energy consumed by a 250 W TV set in 1 h is more than the energy consumed by a toaster of power 1200 W in 10 minutes.