Two light bulbs and a battery are connected in a circuit show below in Figure 3.

Question

Two light bulbs and a battery are connected in a circuit show below in Figure 3. Compare the current through A now, as in Figure 3 above, to the current through A before with only one bulb, as in Figure 1. The current through A is now the same as before. The current through A is now smaller than before but not half as large. None of these is correct. The current through A is now twice as large as before. The current through A is now larger than before but not twice as large. The current through A is now half as large as before. Compare the potential difference across the bulb. VBC, now, as in Figure 3, to what it was before when there was only one bulb, as in Figure 1. None of these is correct. The potential difference is now the same as before. The potential difference is now twice as large as before. The potential difference is now smaller than before but not half as large. The potential difference is now larger than before but not twice as large. The potential difference is now half as large as before. Compare the brightness of the bulb. BC, now, as in Figure 3, to what it was before when there was only one bulb, as in Figure 1. The blub is dimmer than it was before. The bulb is brighter than it was before. The bulb is just as bright as before.

Explanation / Answer

When resistors are added in parallel, it decrease theresistance. If the resistors are 3 resistors, the resistance forFigure 1 would be 3 and the resistance for Figure 2 would be1.5. The resistance with two resistors in parallel ishalf as much as the single resistor circuit, therefore the currentFigure 2 must be twice as much. The statement that is correctis statement 2. Hope that helps

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