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Current Electricity: Charging a Cell MCQ

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Charging a CellHardQuestion 31634

Question

When a cell (EMF E, internal resistance r) is being charged by an external source (V > E), terminal voltage is:
  1. A
    E − Ir
  2. B
    E + Ir
    Correct
  3. C
    Ir − E
  4. D
    E × r

Correct answer

E + Ir

Explanation

During charging, current flows into the positive terminal. Terminal voltage V = E + Ir (higher than EMF). Charging requires V > E.

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