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 and time = t Energy consumed by a TV set of power 250 W in 1 h = 250×3600=9×105J Energy consumed by a toaster of power 1200 W in 10 minutes = 1200×600 =7.2×105J 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.
