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Who will spend more electrical energy? 500 W TV Set in 30 mins, or 600 W heater in 20 mins? - Science and Technology 1

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Numerical

Who will spend more electrical energy? 500 W TV Set in 30 mins, or 600 W heater in 20 mins?

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Solution

For T.V. set: Power = 500 W,

Time = 30 min = 30 × 60 s

∴ Energy = Power × time

E1 = 500 × 30 × 60 = 900 × 103 J

For Heater: Power = 600 W,

Time = 20 min = 20 × 60 s

∴ Energy (E2) = 600 × 20 × 60

= 720 × 103 J

Comparing E1 and E2, E1 > E2

∴ Energy spent by T.V. set (E1) is greater.

The energy consumed by T.V. set is more than that consumed by heater.

Concept: Electric Circuit
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