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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 (R) of the bulb can be calculated using the formula
On substituting the known values, we get \Omega.
From the Ohm's law, the formula of resistance is given as
On substituting the known values, we get \Omega.
Let x number of bulbs to be connected in parallel to obtain a resistance R.
By simplifying and substituting the known values in the above formula, we get lamps.
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