Question Constellation Sign up for free AQA · GCSE · Physics · Higher
Low Voltage Electrical Safety
A student investigated how the length of a wire affects the resistance of the wire at constant temperature.
The student used a cell that had a potential difference of 1.50 V.
Explain why the cell was not an electrical hazard to the student in the investigation.
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Marking points
- 1 Identifies 1.50 V as a very low potential difference.
- 2 Links the low potential difference to no/low shock risk or an explicitly allowed thermal consequence.
Full-mark answer
A potential difference of 1.50 V is very low, so it does not create a significant risk of electric shock to the student.
Why this answer loses marks
It is safe because the cell is small.
Physical size does not establish electrical safety; link the very low potential difference to the risk of electric shock.