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PHYSICS 题目求救
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这是我的TEST 题目
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Figure 3 shows four identical resistors connected to a battery . when the switch is opened , the current through the battery is Io
(i) When the switch is closed , will the current through the battery increase ,decrease or remain unchanged?
(ii) Calculate the current that flows through the battery when the switch is closed . Give your answer in therms of Io
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发表于 29-1-2013 07:06 PM
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不是remain unchanged 吗? since close or not close, potential different between 2 points 都是 0 |
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发表于 22-2-2013 11:28 PM
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用kirchoff current 和 voltage law来算 |
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发表于 10-3-2013 06:21 PM
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current 会走最短的路!!!如果switch on(closed),total R = R+[(R*R)/(R+R)] 。反之,total R = (2R*2R)/(2R+2R) |
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发表于 14-6-2013 11:47 PM
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发表于 14-8-2013 10:22 PM
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我想无论是close或者open,那个current都应该一样。因为那个switch的两端的potential difference应该是0,所以应该没有current经过中间的电线。
请问我的见解对吗? |
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发表于 12-11-2018 01:35 AM
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寒影 发表于 14-8-2013 10:22 PM
我想无论是close或者open,那个current都应该一样。因为那个switch的两端的potential difference应该是0,所以应该没有current经过中间的电线。
请问我的见解对吗?
不对,只不过是因为那4个resistor的value一样,加上那个排列做到无论switch open还是close,经过series跟Parallel拿到的total resistance一样
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