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Question:

Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A?

Answer:

The resistance of each bulb can be calculated using the relation,

It is given,

So, the resistance of each bulb is 4840 .

Let the number of lamps be .

When lamps are connected in parallel, the equivalent resistance will be,

{Given}

{Given}

Using ohms law,

Putting the value of in equation (1), we get

Therefore, 110 electric bulbs are connected in parallel.

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