Exam-style question
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If a circuit has a total resistance of 10 Ω and a current of 2 A, what is the potential difference across the circuit? Scenario focus: a two-resistor Ohm law example, where the answer must state why potential difference is the output quantity.
- A.20 V
- B.5 V
- C.10 V
- D.2 V
Model answer
What a good answer should say
- 20 V
Explanation
Why this works
The correct answer is 20 V. In this version, the deciding idea is a two-resistor Ohm law example, where the answer must state why potential difference is the output quantity.
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.