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What is the energy in $kWh$ consumed in $24$ hours by two electric devices, one of $150 W$ and the other of $450 W$ ?

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14.4 kWh

12.6 kWh

10.8 kWh

15.4 kWh

answer is A.

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Detailed Solution

The energy will be

14.4 kWh

.
Given, Power rating of the first device,

P_{1} = 150 W

Time

t_{1} = 24 hours

Power rating of the second device

P_{2} = 450 W

Time

t_{2} = 24 hours

Energy consumed by both devices

= P_{1} t_{1} + P_{2} t_{2}

= (150 x 24) + (450 x 24) Wh

= (3600 + 10800) Wh

= 14400 Wh

= 14.4 kWh

Therefore, the energy consumed in

kWh

by both the electric devices is

14.4 kWh

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