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

E_{1} = 500 × 30 × 60 = 900 × 10^{3} J

For Heater: Power = 600 W,

Time = 20 min = 20 × 60 s

∴ Energy (E_{2}) = 600 × 20 × 60

= 720 × 10^{3} J

Comparing E_{1} and E_{2}, E_{1} > E_{2}

∴ Energy spent by T.V. set (E_{1}) is greater.

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

Concept: Electric Circuit

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