Exam-style question
Try this first
What happens to the current in a circuit if the resistance is doubled while the potential difference remains constant?.
- A.The current doubles.
- B.The current halves.
- C.The current remains the same.
- D.The current quadruples.
Model answer
What a good answer should say
- The current halves.
Explanation
Why this works
The correct answer is The current halves.. 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.