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Standard X

Physics

Precautions While Using Electricity

In a large bu...

Question

In a large building, there are 15 bulbs of 40 W, 5 bulbs of 100 W, 5 fans of 80 W and 1 heater of 1 kW. The voltage of the electric mains is 220 V. The maximum capacity of the main fuse of the building will be

12 A

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14 A

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8 A

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10 A

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Solution

The correct option is A 12 A
Here, total power, $P = (15 \times 40) + (5 \times 100) + (5 \times 80) + (1 \times 1000)$ $= 2500 W$
Now, using relation, P = VI or $I = \frac{P}{V}$
$I = \frac{2500}{220}$ = 11.3 A
Thus, the minimum capacity should be 12A.

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In a large building, there are 15 bulbs of 40 W, 5 bulbs of 100 W, 5 fans of 80 W and 1 heater of 1 kW. The voltage of the electric mains is 220 V. The maximum capacity of the main fuse of the building will be

The correct option is A 12 AHere, total power, P=(15×40)+(5×100)+(5×80)+(1×1000) =2500 W Now, using relation, P = VI or I=PV I=2500220 = 11.3 A Thus, the minimum capacity should be 12A.

The correct option is A 12 A
Here, total power, $P = (15 \times 40) + (5 \times 100) + (5 \times 80) + (1 \times 1000)$ $= 2500 W$
Now, using relation, P = VI or $I = \frac{P}{V}$
$I = \frac{2500}{220}$ = 11.3 A
Thus, the minimum capacity should be 12A.