Resistor Circuit Symbols

Views: 31     Author: Site Editor     Publish Time: 2020-06-22      Origin: Site

Resistors are one form of passive components and one of the most widely used within electronic equipment. Even though they are passive components, they are still used very extensively.

Accordingly resistor circuit symbols are found in virtually all circuit diagrams or schematic diagrams.

Often the circuit schematic symbols are associated with PCB shapes for use when designing PCBs. The complete circuit symbol for the circuit diagram or schematic are associated with the PCB shape so that the PCB design can be developed electronically from the electronic copy of the circuit.

There are several different types of resistor for which distinct circuit symbols are required. Also different circuit symbols tend to be used within Europe and the USA.

Table: Resistor Circuit Symbols





Resistor (IEEE)

Resistor reduces the current flow

resistor II

Resistor (IEC)

resistor II

Potentiometer (IEEE)

Adjustable resistor - has 3 terminals

resistor II

Potentiometer (IEC)

variable resistor

Variable Resistor / Rheostat (IEEE)

 Adjustable resistor - has 2 terminals

variable_resistor II

Variable Resistor / Rheostat (IEC)


Trimmer Resistor

Preset resistor



Thermal resistor - change resistance when temperature changes


Photoresistor / Light dependent resistor (LDR)

Photo-resistor - change resistance with light intensity change

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