Types of resistors

Three basic types of resistors are use in automotive electrical systems, fixed value resistors, stepped or tapped resistors, and variable resistors. Different symbols are used for the different types of resistors.
Resistors types

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Resistors types

• 1.FIXED-VALUE RESISTORS

  Wire-wound resistors are made with coils of resistance wire. Sometimes called power resistors, they are very accurate and heat stable. The resistance value is marked. · Carbon resistors are common in electronic systems. Carbon is mixed with binder; the more carbon, the lower the resistance

• 2.STEPPED OR TAPPED RESISTORS

  Stepped or tapped resistors have two or more fixed resistance values. The different resistances (carbon or wire) are connected to different terminals in a switch. As the switch is moved, different resistance values are placed in the circuit.

• 3.VARIABLE RESISTORS

  Three types of variable resistors are used: rheostats, potentiometers, and thermistors. RHEOSTAT, POTENTIOMETER, THERMISTOR, Both types of thermistors change resistance with increasing temperature (NTC, resistance goes down as temperature goes up; PTC, resistance goes up as temperature go up.)