Exam-style question
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In a circuit, if the emf is 10 V and the lost volts are 2 V, what is the terminal potential difference? Scenario focus: an emf and internal resistance context, where terminal potential difference is lower when current flows.
- A.8 V
- B.10 V
- C.12 V
- D.2 V
Model answer
What a good answer should say
- 8 V
Explanation
Why this works
The correct answer is 8 V. In this version, the deciding idea is an emf and internal resistance context, where terminal potential difference is lower when current flows.
That makes the correct option the one that uses the appropriate electricity quantity and unit, while the distractors either swap related circuit quantities or apply a rule from the wrong circuit situation.
Common mistake
No common mistake is linked to this question yet.