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[問題] PHY circuit 一問

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PHY circuit 一問


想問下點做?
除左用a level Kirchhoff's Law 有無其他方法?
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I think you don't need to use Kirchoff's law to solve it.
Since the circuit is symmetrical between 2 sides. If you consider the current flow out from the cell is I then the current to flow through the 8 ohm resistor will be 2I. So: 2I*8+I*4=10 or 20I=10 or I=0.5. So the answer should be 1A of current to flow through the 8 ohm resistor.

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回覆 2# Delta123 的帖子

但係點解V會當係10V唔系20V?

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The positive terminal of X and Y are connected together so the two cells are not in series and the net emf should still be 10 instead of 20V.

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回覆 4# Delta123 的帖子

If they are not in series, then they are in parallel, why the net emf is not reduced by half to 5V?

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其實DSE唔會考呢種

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Actually the cell plus their internal resistances are in parallel. Note that only resistance will change (to smaller) if they are in parallel but the voltage of a cell will not. It always remains constant.

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