Question

Q16:

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

Solution:

Energy consumed by an electrical appliance is given by the expression,



Where,

Power of the appliance = P

Time = t

Energy consumed by a TV set of power 250 W in 1 h = 250 × 3600 = 9 × 105 J

Energy consumed by a toaster of power 1200 W in 10 minutes = 1200 × 600

= 7.2× 105 J

Therefore, the energy consumed by a 250 W TV set in 1 h is more than the energy consumed by a toaster of power 1200 W in 10 minutes.
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Answer 1

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Answer 2

Answer:

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