Assume the battery is ideal (it has no internal resistance) and connecting wires

Question

Assume the battery is ideal (it has no internal resistance) and connecting wires have no resistance. Unlike most real bulbs, the resistances of the bulbs in the questions below do not change as the current through the them changes. Three decimal bulbs are in the circuit as shown below in the figure. (The switch S is initially closed.) Which of the following correctly ranks the bulbs in brightness? Bulb B and C are equally bright, and each is brighter than A. Bulb A is the brightest, and B and C are equally bright. None of these is correct. Bulb A is the brightest, B is next brightest, and C is the least brightest. All bulbs are equally bright. Which of the following correctly ranks the current flowing through the bulbs? Bulb B and C have the same current, and each has more current than A. Bulb A has the largest current, and B and C have the same current. None of these is correct. All bulbs have the same current flowing through them. Bulb A has the largest current, and C has the smallest current. Which of the following correctly ranks the potential difference across the bulbs? All bulbs have the same potential across them. Bulb A has the largest potential difference, and B and C have the same potential difference. The potential difference is largest across A, and smallest across C. Bulb B and C have the same potential difference, and each has more potential difference than A. None of these is correct. What happens to the current through bulb A if the switch S is opened? It decreases More information is necessary to answer the question. It increases. It remains the same. What happens to the current through bulb B if the switch S is opened? It increases Not enough information is given. It remains the same. It decreases.

Explanation / Answer

for first problem (014) option 2 is correct. for second problem (015) option 2 is correct. for third problem (016) option 2 is correct.

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