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There are basically two types of resistors.
-Fixed resistors
-Variable resistors

FIXED TYPE:
Fixed resistors are classified into 4 types based on various factors like manufacturing style,resistance range,power rating etc.
The four types of fixed resistors are
1)Carbon composition
2)Carbon film
3)Metal film(again classified into thick film resistors and thin film resistors)
4)Wire wound-which consists of power style type and precision style type

VARIABLE TYPE:
They are used in electronic circuits to adjust the value of voltages and currents.Ex. They are used in televisions as volume control,brightness control etc. There are three types of variable resistors.They are
1)Potentiometer-classified into carbon potentiometer and wire wound potentiometer
2)Rheostat
3)Trimmer

Wire-wound, carbon compound, metal strip, and in modern times, the silicon transistors in linear region are used as resistors

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