Exam-style question
Try this first
What does Ohm's law state about the relationship between potential difference and current?.
- A.Potential difference is directly proportional to current.
- B.Potential difference is inversely proportional to current.
- C.Potential difference is equal to current times resistance.
- D.Potential difference is independent of current.
Model answer
What a good answer should say
- Potential difference is equal to current times resistance.
Explanation
Why this works
Ohm's law states that the potential difference (V) across a conductor is directly proportional to the current (I) flowing through it, provided the temperature remains constant. This is expressed as V = I × R, where R is the resistance.
Therefore, the correct option is that potential difference is equal to current times resistance.
Common mistake
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