Resistor symbols of electrical & electronic circuit diagram – resistor, potentiometer, variable resistor.
Table of resistor symbols
 | Resistor (IEEE) | Resistor reduces the current flow. |
 | Resistor (IEC) | |
 | Potentiometer (IEEE) | Adjustable resistor – has 3 terminals. |
 | Potentiometer (IEC) | |
 | Variable Resistor / Rheostat (IEEE) | Adjustable resistor – has 2 terminals. |
 | Variable Resistor / Rheostat (IEC) | |
 | Trimmer Resistor | Preset resistor |
 | Thermistor | Thermal resistor – change resistance when temperature changes |
 | Photoresistor / Light dependent resistor (LDR) | Photo-resistor – change resistance with light intensity change |