An electric heater is rated 1500 W. How much energy does it use in 10 hours?

Power (P) = 1500 W

Time (t) = 10 hours = (10 × 60 × 60) seconds

= 36,000 seconds

We know that, Energy (E) = Power × time

= 1500 × 36,000 J

= 5,40,00,000 J

= 5.4 × 10⁷ J