Advanced Qualification · A-004 Power supplies · A-004-001-002

In a half-wave power supply with a capacitor input filter and a load drawing little or no current, the peak inverse voltage (PIV) across the diode can reach _____ times the RMS voltage.

1. A 2.8
2. B 0.45
3. C 5.6
4. D 1.4

Correct answer: A — 2.8. From the official ISED question bank, verified word for word.

Why

In a half-wave supply with a capacitor filter and almost no load, the capacitor charges to the peak voltage of the AC wave and holds it there. The full explanation — and one for every question — is in Pro.

Practise this section

Power supplies: rectifiers, filtering, regulation, switching supplies and their failure modes.

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