Question

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

Answer 1

Energy consumed by the TV set,
E = P $\times$ t
= 250 $\times$ 1 = 250 Wh
Energy consumed by the toaster,
E = P $\times$ t
= 1200 W $\times$ $\frac{10}{60}$ h (10 min = $\frac{10}{60}$ h )
= 200 Wh
Thus, it is clear that the TV set consumes more electrical energy.