Might be doubtful wondering is this a potential meter or a rheostat?
Or basically both have similar functions? Thanks for advice.

 

The schematic you posted is a potentiometer wired as a rheostat.

It provides a means of changing the resistance between the symbol labeled UV (whatever that is) and the wire that goes off to the right.

A potentiometer has 3 terminals and can be wired as a potentiometer or as a rheostat. A true rheostat has only two terminals, and can only be wired as a rheostat (provides series resistance).

If a potentiometer has one end terminal connected to a voltage reference level, and the other end terminal connected to a different voltage reference level, then the middle terminal (wiper) can output a voltage potential anywhere between the two voltage reference levels.

 

The schematic you posted is a potentiometer wired as a rheostat.

Thanks for your reply. As i know potential meter has a knob and 3 pins ...
wired as rheostat means...?

 

It is called a "potentiometer" (also called "pot") not a "potential meter".

I added more information to my original post.

 

ok..thanks.....got it..