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Question
Several electric bulbs each of power 10 W designed to be used on a 220 V electric supply line . How many bulbs can be connected in parallel with each other across two wires at 220 V line, if the maximum allowable current is 5 A?
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Solution
We found a similar question to the one that you posted. Please check it out here. Resistance of each bulb, r = V2P = 220210 = 4840 Ω
Total resistance in the circuit, R = 220V5A = 44 Ω
Let n be the number of bulb (each of resistance r) to be connected in parallel to obtain a resistance R.
Clearly, Rnet = rn or n = rR = 4840Ω44Ω = 110 bulbs
Resistance of each bulb, r = V2P = 220210 = 4840 Ω
Total resistance in the circuit, R = 220V5A = 44 Ω
Let n be the number of bulb (each of resistance r) to be connected in parallel to obtain a resistance R.
Clearly, Rnet = rn or n = rR = 4840Ω44Ω = 110 bulbs
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