Discussion
Three lamps Lamp1, Lamp2 and Lamp3 are connected in parallel to a single AC supply as shown in the given figure. Suppose the voltmeter reading connected across Lamp1 is 100 V, what will be the reading of the same voltmeter if it is connected across Lamp3?
Answer: A
The three lamps are connected in parallel across the same AC supply, and in a parallel connection the voltage across every branch is the same as the supply voltage. The voltmeter reading across Lamp1 is 100 V, so the same voltmeter connected across Lamp3 also reads 100 V. The value 50 V would be correct for two equal lamps in series, 300 V would be the sum for three lamps in series and 33.33 V would be a third of 100 V, and none of those is the case. The answer is 100 V, option (A).
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