Question

Which uses more energy a 250 w tv set in 1 hr or a 1200 W. Toaster in 10 min S

Answer 1

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Energy consumed by an electrical appliance is given by

H = Pt

For the TV set:

Power W = 250 W

time t = 1 hour = 3600 seconds

So, energy consumed

H = 250 × 3600 = 900000 J

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For the toaster:

Power W = 1200 W

time t = 10 minutes = 600 seconds

So, energy consumed H = 1200 × 600 = 720000 J

Hence, TV set uses more energy than toaster.

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Answer 2

⇒ Power (P) TV = 250 W

⇒ Time Taken (t) = 1 hr

⇒ Heat = Power × Time

⇒ H = Pt

⇒ 250 W × 1hr

⇒ 250 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.

The energy consumed by 1200 W Toaster in 10 minutes = 200 Wh

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