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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?
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,
Using ohms law,
Putting the value of in equation (1), we get
Therefore, 110 electric bulbs are connected in parallel.
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