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 diode I-V experiment is performed. The student records forward voltage and current, then reverses the supply terminals for reverse bias.
Total: 4 marks
(a) Which branch of the graph should be used for forward-bias readings? (1 mark)
(b) Why should a current-limiting resistance be used in forward bias? (1 mark)
(c) Why is the reverse current scale usually smaller? (1 mark)
(d) State one precaution before reversing the supply terminals. (1 mark)
Something wrong with this item?