i2 suggested time 25 minutes) In a physics the two circuits shown above In one c
ID: 2076430 • Letter: I
Question
i2 suggested time 25 minutes) In a physics the two circuits shown above In one circuit, lighthoulbs A and B will be connected to a battery in scries. In the other circuit, lightbulbs Cand D will be connected to an identical battery in parallel. All four lightbulbs are identical. Student 1 predicts that the bulbs will be brighter in the series arrangement, while Student 2 disagrees and predicts that the bulbs will be brighter in the parallel arrangement. Their arguments are as follows. Student l: "Bulbs A and B will be brighter than Cand D because in the series circuit, each bulb gets all the current coming out of the battery. But in the parallel circuit each bulb gets only half the current." Student 2: "But you're not taking into account that bulb A uses up some of the current before it reaches bulb B, making the bulbs dimmer in the series circuit. And in the parallel circuit, the full voltage of the battery is across each bulb, so it's as if the other bulb weren't even there. So bulbs Cand D will be brighter." (a For part (a), ignore whether the students' predictions are correct or incorrect. Do not simply repeat the students' arguments as your answers. i. Which aspects of Student l's reasoning, if any, are conrect? Explain your answer. ii. Which aspects of Student l's reasoning, if any, are incorrect? Explain your answer. i. Which aspects of Student 2's reasoning, if any, are correct? Explain your answer. iv. Which aspects of Student 2's reasoning, if any, are incorrect? Explain your answer.Explanation / Answer
i) current will be distributed in bulbs C and D is correct.
ii) Bulb A and B will be brighter is incorrect because in series circuit, more resistance causes less current, So net current in A and B will be smaller than that in C and D.
iii) In parallel circuit, full voltage is applied to each bulb is correct.
iv) Bulb A uses up some of its current is incorrect because current is constant in whole circuit. Whatever comes in, goes out.
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