Exam-style question
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In a potential divider circuit with a total resistance of 15 Ω and a supply voltage of 45 V, what is the output voltage across a 5 Ω resistor? Scenario focus: a mains electricity context, where power and energy are separated before choosing the unit.
- A.15 V
- B.10 V
- C.5 V
- D.30 V
Model answer
What a good answer should say
- 15 V
Explanation
Why this works
The correct answer is 15 V. In this version, the deciding idea is a mains electricity context, where power and energy are separated before choosing the unit.
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.