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

Where,

Power of the appliance = *P*

Time = *t*

Energy consumed by a TV set of power 250 W in 1 h = 250 ×3600 = 9 ×10^{5} 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

= 7.2×10^{5} 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.