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Question

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?


  1. 110

  2. 580

  3. 220

  4. 50


Solution

The correct option is A

110


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,                R = rn or n = rR = 4840Ω44Ω = 110

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