Question

which uses more energy A 25 Watt TV sets in 1 hour or a 1200 watt toaster in 10 minutes

Answer 1

⇒ Power (P) TV = 25 W

⇒ Time Taken (t) = 1 hr

⇒ Heat = Power × Time

⇒ H = Pt

⇒ 25 W × 1hr

⇒ 25 Wh

therefore , the energy consumed by 250 W TV set in 1 hr = 250 Wh.

⇒ Power (P) Toaster = 1200 W

⇒ Time Taken (t) = 10 minutes

⇒ H = Pt

⇒ 1200 × 10/60

⇒ 200 Wh.

Therefore, Energy consumed by Toaster is more than by the TV in the giving timing.