1. In the circuit below, the battery maintains a constant potential difference b

Question

1. In the circuit below, the battery maintains a constant potential difference between its
terminals at points 1 and 2 (i.e., the internal resistance of the battery is considered
negligible).

The three light bulbs, A, B and C are identical.
A. How do the brightnesses of the three bulbs compare to each other? Explain your
reasoning.
B. What happens to the brightness of each of the three bulbs when bulb A is
unscrewed and removed from its socket? Explain your reasoning.

C. What simultaneously happens to the current through points 3, 4 and 5? Explain
your reasoning.
D. Bulb A is screwed back in. What happens to the brightness of each of the three
bulbs when bulb C is unscrewed and removed from its socket? Explain your
reasoning.
E. What simultaneously happens to the current through points 3, 4 and 5? Explain
your reasonin

below, the battery maintains a constant potential difference be its terminals at points 1 and 2 (I,e, the internal resistance of the bad considered negligible).

Explanation / Answer

1. B goes out as it is shorted. C gets brighter, A is unchanged

2. goes up, goes from 1.5 to 2, where 1 is current through A. that is an increase of 2/1.5 = 4/3 = 33%

3. goes to zero, it's shorted

4. goes up to battery voltage, was half battery voltage, so it increased 2x

5. unchanged, it is battery voltage.

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