Case study·Standard multi-step (3/5)·No calculator
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
A student records current and potential difference for a wire: in SI units.
Total: 4 marks
(a) Why should a best-fit line be used instead of joining the points one by one? (1 mark)
(b) Estimate the resistance from the first and last readings. (1 mark)
(c) Name one likely source of scatter in these observations. (1 mark)
(d) State whether the data roughly supports Ohm's law. (1 mark)
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