Some manufacturers even get them wrong in their schematic legends.
40+ Schematic Symbol Of Potentiometer Connected As Rheostat Pics. We see that rheostat and potentiometer share same construction. Terminal a, terminal b and terminal the american standard and the international standard symbol of rheostat is shown in the below figure.
Electrical Symbols | Resistors from www.conceptdraw.com
If only two terminals are used, one end and the wiper, it acts as a variable resistor or rheostat. Rheostat is a big size variable resistor used to vary big values of current. They can also be preset type that have an adjustable screw.
It uses only two connections, even when 3.
Consider s is the switch used for connecting or. Trimmers are potentiometers which need shunts resistors are connected in parallel with an instrument or component to divert electrical current. There are actually two, according to the iec (international electrotechnical commission). And this is the one for a preset rheostat:
