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Which Uses More Energy, a 250 W Tv Set in 1 Hr, Or a 1200 W Toaster in 10 Minutes? - CBSE Class 10 - Science

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Question

 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,H= Pt
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
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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Solution Which Uses More Energy, a 250 W Tv Set in 1 Hr, Or a 1200 W Toaster in 10 Minutes? Concept: Electric Power.
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