Bridge Rectifier:

This is an old style bridge rectifier i found in a reel to reel tape recorder

This is the layout for the bridge

Below are 2 types of xingle phase rectifiers, most commonly used in power supplies

Mainly in industry you are likely to find 3 phase rectifiers like this

And in rare industrial systems you may even find a 6 phase rectifier

Just to note, a rectifier does NOT change AC to DC, a half wave rectifier only allows positive half vycles to go through on the positive cycle only, a bridge rectifier does the same thing except on both half cycles, so you get positive going waves.
To get any sort of DC you would need to add a capacitor to 'smooth' the waveform

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