Exam-style question
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How does internal resistance affect the performance of a battery in a circuit?.
- A.It increases the emf of the battery.
- B.It decreases the terminal potential difference.
- C.It has no effect on the circuit.
- D.It increases the charge flow.
Model answer
What a good answer should say
- It decreases the terminal potential difference.
Explanation
Why this works
Internal resistance causes energy to be lost as heat within the battery, which reduces the terminal potential difference available for the circuit, affecting overall performance.
Common mistake
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