# Resistor Symbols

The **resistors** are passive components manufactured specifically to provide a given value of resistance to the passage of electric current. Its unit of measurement is the ohm and is represented by the Greek letter omega.

Symbol | Description | Symbol | Description | |
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Resistor IEC system |
Resistor NEMA system |
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Impedance | Heating element | |||

Shunt resistor connections with current and voltage | Resistor with sockets of current | |||

Resistor with connects fixed | Nonreactive resistance | |||

Not burnable resistor | Resistor nonreactive | |||

Protective resistor Makes the function of fuse |
Attenuator | |||

Protective resistor Makes the function of fuse |
Memristor Memory resistor |
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Resistor array e.g. 8 resistors |
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## Symbols Variable & Adjustable Resistors |
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Variable resistor Rheostat |
Variable resistor Rheostat |
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Continuously variable resistor | Stepwise variable resistor | |||

Stepwise variable resistor | Potentiometer | |||

Adjustable resistor Pre-set rheostat |
Potentiometer with moving contact | |||

Adjustable resistor Pre-set rheostat |
Potentiometer with moving contact and default settings | |||

Pre-set resistor | resistor with moving contact and off position | |||

Variable resistor with discs carbon | ||||

## Symbols of Special Resistors |
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LDR - Photoresistor Light dependent resistor. By increasing the light intensity decreases resistance |
LDR - Photoresistor, The width is the side exposed to light | |||

LDR - Photoresistor NEMA system |
LDR - Photoresistor | |||

NTC Resistor - Thermistor Negative temperature coefficient The resistance decreases with increasing temperature |
PTC Resistor - Thermistor Positive temperature coefficient The resistance increases with increasing temperature |
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NTC Resistor - Thermistor NEMA system |
VDR - Varistor The voltage-dependent resistor |
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Thermistor | VDR - Varistor | |||

VDR - Varistor The low resistance with increasing voltage |
Barretter | |||

VDR - Varistor NEMA system |
Magnetic resistor Their resistor depends on magnetic fields |
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RTD Resistance temperature detector |
RTD Resistance temperature detector |
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## Picture gallery of resistor |