Question

Question 16
Which uses more energy, a 250 W TV set in 1 h, or a 1200 W toaster in 10 minutes?

Answer 1

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 = $250\times 3600=9\times {10}^{5}J$
Energy consumed by a toaster of power 1200 W in 10 minutes = $1200\times 600$ $=7.2\times {10}^{5}J$
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.