Case study·Hard exam skill (4/5)·Calculator allowed
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 school laboratory has a galvanometer of resistance and full-scale current . It must be used once as a ammeter and once as a voltmeter.
Total: 6 marks
(a) Find the shunt resistance for the 3.0 A ammeter. (3 marks)
(b) Find the series resistance for the 6.0 V voltmeter. (2 marks)
(c) Explain why the two added resistances are very different. (1 mark)
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