Exam-style question
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In a circuit, if the resistance is 4 Ω and the current is 2 A, what is the potential difference across the resistor? Scenario focus: a circuit graph interpretation, where the gradient links resistance to potential difference and current.
- A.8 V
- B.2 V
- C.4 V
- D.6 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 a circuit graph interpretation, where the gradient links resistance to potential difference and current.
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.