Resistors

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Type of resistors :

a) Carbon Composition-
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          It is a combination of carbon particles and a binding resin with different proportions for providing desired resistance.
They are available in power ratings of 1/8, 1/4, 1/2 ,1 and 2 W.
and their voltage ratings are of 250, 350 and 500 V.
This kind of resistors have a tendency to produce electrical noise due to the current passing from one particle to another.

b) Deposited Carbon-
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           It consists of ceramic rods which have a carbon film deposited on them. They have a ceramic rod in a mithane filled flask which is heated until a carbon film is deposited on them.

    
c) High-Voltage Ink film-
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   range : 1 kiloohm to 100000 Megaohm with voltage range upto 1000 kv.
It consists of a ceramic base on which a special resistive ink is laid down in a helical band.

d) Metal film-
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    made by depositing vaporized metal in vacuum on a ceramic rod. Suitable for high grade applications.

e) Metal Glaze-
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   consists of a metal glass mixture which is applied as a thick film and then fired to form a film.
range : 1 ohm to Megaohm

f) Wire-wound -
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       high stability and highest power rating.
Because of their bulk, high-power ratings and high cost, they are not suitable for low cost or high density, limited-space applications.

g) Cermet(ceramic metal)-
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       made by firing certain metals added with ceramic sub-strate.
Resistance value depends on the type of mix and how thick it is. Those are usually used in PCB(printed circuit board).

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