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 is used to protect a sensitive circuit by allowing current only when its p-side is at a higher potential than its n-side. In one test, the p-side is connected to through a resistor and the n-side is connected to the negative terminal. In another test the battery is reversed.
Total: 5 marks
(a) Name the biasing in the first test. (1 mark)
(b) Name the biasing in the second test. (1 mark)
(c) In which test is the diode current larger? (1 mark)
(d) Explain using depletion layer/barrier language. (2 marks)
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