Exam-style question
Try this first
Which of the following correctly describes the relationship between emf and terminal potential difference?.
- A.Emf is always greater than terminal potential difference
- B.Emf is equal to terminal potential difference
- C.Terminal potential difference is always greater than emf
- D.Emf and terminal potential difference are unrelated
Model answer
What a good answer should say
- Emf is always greater than terminal potential difference
Explanation
Why this works
The electromotive force (emf) is the total energy supplied per unit charge, while the terminal potential difference is the voltage available at the terminals of the battery, which is always less due to internal resistance.
Common mistake
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