In full wave rectification, the number of diodes depends on the type of circuit used:

  • In a bridge full-wave rectifier , 4 diodes are used.
  • In a centre-tapped full-wave rectifier , 2 diodes are used.

In most basic electronics questions, when they ask “in full wave rectification how many diodes are used” without specifying the type, they usually expect the answer for the bridge full-wave rectifier , which is:

4 diodes are used in full wave rectification (bridge type).

Quick Scoop: What’s Going On?

  • Full-wave rectification means both halves of the AC waveform are converted to DC.
  • There are two popular ways to do this:
    1. Centre-tapped full-wave rectifier → uses 2 diodes and a centre-tapped transformer.
2. **Bridge full-wave rectifier** → uses 4 diodes, no centre tap needed, very common in power supplies.

So, if your exam or textbook MCQ just says “full wave rectification” with options like 1, 2, 3, 4 diodes, the safest chosen answer is 4 diodes.

Information gathered from public forums or data available on the internet and portrayed here.