[问答题]
When applying Kirchhoff’s
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g9 8bh+tw+z .asrx2gloop rule (such as in Fig. Below), does the sign (or direction) of a battery’s emf depend on the
2.ga+hbx zgt r8+w9 lsdirection 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
