Exam-style question
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A potential divider circuit has a supply voltage of 30 V and consists of two resistors, 10 Ω and 20 Ω. What is the output voltage across the 20 Ω resistor? Scenario focus: a kilowatt-hour comparison, where the answer must connect power rating to duration of use.
- A.10 V
- B.20 V
- C.15 V
- D.30 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 kilowatt-hour comparison, where the answer must connect power rating to duration of use.
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.