Exam-style question
Try this first
In a circuit, if the potential difference across a resistor is 12 V and the current flowing through it is 3 A, what is the power dissipated by the resistor?.
- A.4 W
- B.36 W
- C.12 W
- D.3 W
Model answer
What a good answer should say
- 36 W
Explanation
Why this works
The correct answer is 36 W. This is correct because it applies the Current electricity idea named in the question, using the required quantities and units rather than mixing current, charge, potential difference, resistance, power, or energy.
The other options are less suitable because they use the wrong electrical quantity, an incompatible unit, or a rule from a different circuit context.
Common mistake
No common mistake is linked to this question yet.