Which one among the following statements related to electric cells is <strong>CORRECT</strong>?
- A. A primary cell is rechargeable.
- B. A secondary cell can be used only once.
- C. The emf of a battery is the power provided by the battery per unit current. ✓
- D. The unit of emf is Joule.
Correct Answer: C. The emf of a battery is the power provided by the battery per unit current.
Explanation
Electromotive force (emf) is mathematically defined as the power (P) supplied divided by the current (I), since P = V \times I. Thus, emf is the power provided by the battery per unit current.
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