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26/09/2021 6:39 pm
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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?
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26/09/2021 6:42 pm
Given: Potential, V = 220 volts, P = 10 W, I = 5 A
Let number of bulbs = n
Applying the formula P = VI, we get:
10 = 220 x I
or I = \(\frac{10}{220}\) = \(\frac{1}{22}\)A
Number of bulbs = \(\frac{Total\;current}{current\;through\;each\;bulb}\)
= \(\frac{5}{\frac{1}{22}}\) = 5 x 22 = 110
Hence, 110 bulbs can be connected is parallel.