Case study·Hard exam skill (4/5)·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
The figure shows an AC input and two possible outputs P and Q from diode rectifier circuits. A source feeds an ideal full-wave rectifier whose secondary peak voltage is across a load. The observation window is .
Total: 6 marks
(a) Which output is half-wave rectified? (1 mark)
(b) Which output is full-wave rectified? (1 mark)
(c) How many full-wave output pulses appear in ? (1 mark)
(d) Find the peak current through the load. (1 mark)
(e) Explain why output Q is still not pure steady DC. (2 marks)
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