Question

Which uses more energy, a 250 W TV set in 1 h, or a 1200 W toaster in 10 minutes? [2 MARKS]

Answer 1

Each point: 1 Mark

1. Energy used by 250 W TV set in 1 h = 250 W × 1h = 250 Wh

2. Energy used by 1200 W toaster in 10 min. (i.e., $\frac{1}{6}$ h) = 1200 W × ($\frac{1}{6}$) h = 200 Wh

Thus, a 250 W TV set uses more power in 1 h than a 1200 W toaster in 10 minutes.