Advanced Qualification · A-004 Power supplies · A-004-001-011
What is the output waveform of an unfiltered full-wave rectifier connected to a resistive load?
- A A series of pulses at twice the frequency of the AC input
- B A steady DC voltage
- C A sine wave at half the frequency of the AC input
- D A series of pulses at the same frequency as the AC input
Correct answer: A — A series of pulses at twice the frequency of the AC input. From the official ISED question bank, verified word for word.
Why
An unfiltered full-wave rectifier flips the negative half of the alternating current so it points upward, creating two positive bumps for every single cycle of the original wave. 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.