A resistor is a device that limits, or resist curent

Precision wire-wound Power wire-wound Fuse resistor Carbon composition Carbon film Metal film Filament wound

Linear resistor- those which obeys OHM’S LAW Non-linear resistor- consist of three types in common use A. Light dependent resistor( LDR )- light sensitive B. Thermistor- heat sensitive C. Voltage dependent resistor

According to type of material Carbon composition Carbon film Metal film Wire wound According to tolerance General purpose (5%or greater) Semi precision (1% - 5%) Ultra precision (less than.5%)

 Made either by hot or cold molding from mixture of carbon and clay binder  Low cost  Resistive value: 10 ohms – megaohms  Uses: commercial, military, and aerospace

 Made from carbon graphite, mixed with powdered insulating materials  Power ratings in watts are available from 1/8 watt – 5 watts  Offers low resistance, using low power

Standard film resistor Chip resistor Network resistor

These are formed by means of vacuum decomposition, a process by which any of the number of different metal or metal oxide films are deposited on a suitable insulating madrel or core.

 Enclose in metal case with a shaft extending outside the case for variable control  The amount of resistance varies from zero to the maximum controls or trimmers where controlled amount of current or voltage is needed

Potentiometer with switch Dual audio pots Liner potentiometer 10 turn panel mounted

Open Out of tolerance Noise control (for potentiometer)