DC Circuits (id: b1d89b56b)

本题目来源于试卷: DC Circuits，类别为 IB物理学

[问答题]
When applying Kirchhofyym) smukdct t,2 u;xg7o82 q5 7y4d sjl ador0pel*7:f’s loop rule (such as in Fig. Below), does the sign (or direction) of a battes0 dearo :lj d*4ly77pry’s emf depend on the direction of current through the battery? What about the terminal voltage?

参考答案:

No, the sign of the battery’s emf does not depend on the direction of the current through the battery.  The sign of the battery’s emf depends on the direction you go through the battery in applying the loop rule.  If you go from negative pole to positive pole, the emf is added.  If you go from positive pole to negative pole, the emf is subtracted.

       But the terminal voltage does depend on the direction of the current through the battery.  If current is flowing through the battery in the normal orientation (leaving the positive terminal, flowing through the circuit, and arriving at the negative terminal) then there is a voltage drop across the internal resistance, and the terminal voltage is less than the emf.  If the current flows in the opposite sense (as in charging the battery), then there is a voltage rise across the terminal resistance, and the terminal voltage is higher than the emf.

本题详细解析: 暂无

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