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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