Question

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

Answer 1

We have a formula :

E=P x t

Energy consumed by the TV set=(250/1000)kW x 1 hour

=0.25 kWh

Energy consumed by toaster=(1200/1000) kW x (10 / 60) hour

=0.20 kWh

It is clear from the above that the energy consumed by TV set is more than the energy consumed by toaster.

Answer 2

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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.

I hope, this will help you___❤❤

Thank you

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