Half-Wave and Full-Wave Rectifiers
Rectification produces pulsating dc from ac. For an ideal sinusoidal input, half-wave ripple repeats at the supply frequency and full-wave ripple repeats at twice the supply frequency.
Why this shows up in the exam
AC-to-DC power supplies · Identifying bridge and centre-tapped circuits · Sketching rectified waveforms
Learn the idea
A rectifier uses one-way diode conduction to convert alternating input into unidirectional output. A half-wave rectifier keeps one input half-cycle. A centre-tapped or bridge full-wave rectifier redirects both half-cycles so current through the load has one direction.
🧠 Memory hook: Half wave uses one half; full wave flips the other half.
Get this one clearly and it pays off every single time it shows up in the paper. 🎯
Formulas & facts to keep ready
- f_ripple = f for half-wave — output ripple frequency of an ideal half-wave rectifier
- f_ripple = 2 f for full-wave — output ripple frequency of an ideal full-wave rectifier
How to approach it
- 1Trace conventional load current in each half-cycle
- 2Mark which diodes conduct
- 3Compare load-current direction rather than source-current direction
Common slip-ups that cost marks
- •Reversing the dc output polarity in a bridge
- •Calling pulsating output perfectly steady dc
- •Forgetting that two bridge diodes conduct in each half-cycle
🌟 That's the whole idea — you've got this. Try the practice set below; every question you attempt makes it stick a little harder.
Original chapter practice
Original questions for this chapter, not past-paper questions or an exact mapping to this individual concept.
A transistor has common-emitter current gain beta = 50. If base current is 20 microA, find collector current.
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