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How many can $40 W$ bulbs be safely connected in a parallel circuit which is drawing $4 A$ current from a $220 V$ supply?

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22

36

19

30

answer is A.

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Detailed Solution

22

bulbs of

40 W

can be safely connected in a parallel circuit which is drawing

4 A

current from a

220 V

supply.
Given,
Current

I = 4 A

Voltage

V = 220 V

And power of each bulb,

P_{B} = 40 W

We know that, power

P = VI

So total power of the circuit,

\Rightarrow

P = 220 \times 4

\Rightarrow

P = 880

The number of bulb

n = \frac{880}{40}

The number of bulbs

n = 22

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