esistor

A resistor is a device that

limits, or resist curent

Precision wire-woundPower wire-woundFuse resistorCarbon compositionCarbon filmMetal filmFilament wound

Variety of resistor

Linear resistor- those which obeys OHM’S LAW

Non-linear resistor- consist of three types in common useA. Light dependent resistor( LDR )-

light sensitiveB. Thermistor- heat sensitiveC. Voltage dependent resistor

Two main categories of 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%)

Classification of resistor

Made either by hot or cold molding from mixture of carbon and clay binder

Low costResistive value: 10 ohms – megaohms

Uses: commercial, military , and aerospace

Carbon composition

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

Carbon film resistor

Standard film resistorChip resistorNetwork resistor

Three distinct types of carbon film 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.

Metal film resistor

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

Variable resistor

Potentiometer with switch

Dual audio potsLiner potentiometer10 turn panel mounted

Different types of variable resistor

OpenOut of toleranceNoise control

(for potentiometer)

Resistor trouble

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