How will the reading in the ammeter A be affected if another identical bulb Q is connected in parallel to bulb P, if the voltage in the mains is maintained at a constant value?
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Member since Feb 20 2013
Let I be the current when bulb P alone is connected in the circuit. If R is the resistance of the bulb P then we have I = V/R, where V is the voltage in the circuit.
Let I' be the current when bulb Q is connected in parallel to bulb P. As both the bulbs are identical, the effective resistance in the circuit is R' = R/2. Hence I' = V/R' = V/(R/2) = 2V/R = 2I.
So the ammeter reading will be doubled if another identical bulb Q is connected in parallel to bulb P, if the voltage in the mains is maintained
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