一个每一个边是电阻R构成的正方体的下平面的西南角到上平面的东北角的电阻是多少?


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送交者: HunHunSheng 于 2008-12-04, 20:29:22:

回答: 什么样的大学课程最适合出习题集? 由 HunHunSheng 于 2008-12-04, 20:09:50:

I don't know it can be solved purely by Ohms law or not.
But a trick is assuming I flow in at one end, it divide into 3 current evenly, then each further divide into 2 currents, then converge back into 3 currents to flow out.

So I*X=1/3IR +1/6IR+1/3+IR

So the resistance is 5/6R.

If you don't depend upon symettry, can you directly
solve this problem?





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