Why is a resistor connected in series witha diode in a rectifier?.

When I asked my teacher he said it is used to make the output voltage unidirectional.It is confusing.Then what is the rectifier for?

I think we need more information to help answer your question. By rectifier, do you mean a diode, or a bridge rectifier, or some other circuit? A schematic would be helpful.
Raji Nainar (author)  LargeMouthBass4 years ago
Thank You for answering.Well my question is about a half wave rectifier
mrmerino4 years ago
Unidirectional? That's what the diode is for. Tell your teacher that I said he has no idea what he's talking about.
iceng4 years ago
What you call a rectifier could be an LED ( almost same symbol )
which needs to have a series resistor for proper operation.

I am also confused by your teacher's reported comment and
I'm an EE with 40 years experience.