Exam-style question
Try this first
If a resistor has a current of 2 A flowing through it and a resistance of 5 Ω, what is the power dissipated by the resistor? Scenario focus: a power-dissipation problem, where the answer must identify heating in the resistor from current squared.
- A.10 W
- B.4 W
- C.2 W
- D.8 W
Model answer
What a good answer should say
- 10 W
Explanation
Why this works
The correct answer is 10 W. In this version, the deciding idea is a power-dissipation problem, where the answer must identify heating in the resistor from current squared.
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.