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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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Answer» Solution :V= 220 V P 10 W ` P = (V^(2))/(R)` `R = (V^(2))/(P)` `= (220xx220)/(10)` `4840 Omega` V =IR `R_(p) = (V)/(I) = (220)/(5) = 44Omega` `R_(p) = (R)/(n) implies n = (R)/(RP)= (4840)/(44) = 110` |
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