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Five Electric Fans of 120 Watts Each Are Used for 4 Hours. Calculate the Electrical Energy Consumed in Kilowatt-hours. - Science

Short Note
Sum

Five electric fans of 120 watts each are used for 4 hours. Calculate the electrical energy consumed in kilowatt-hours.

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Solution

Power of each fan,
(P) = 120 W
      = 0.12 kW
Time duration, (t) = 4 hr
Now, we can calculate the electrical energy consumed as,
Energy consumed = Power × Time
So,
Energy consumed by 1 fan
= 0.12 × 4 kWh
= 0.48 kWh
So, the energy consumed by 5 fans is,
Energy consumed by 5 fan
 = (0.48) (5) kWh
= 2.4 kWh

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APPEARS IN

Lakhmir Singh Science Class 9 Physics
Chapter 4 Work and energy
Short Answers | Q 24 | Page 163
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