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CHAPTER 2

PASSIVECOMPONENT

RESISTORS1

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RESISTORS

the most common components in electrequipment

is manuacture! "ith speci#c $alue o o

or its resistance %R&

the purpose o usin' a resistor in a circis either to re!uce current %I& to a spec

$alue or to pro$i!e a !esire! $olta'e %V

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(in!s o Resistors

1)*i+e! Resistor2)Varia,le Resistor

-

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Fixed Resistor

an. resistor "hose resistancnot a!/usta,le or $aria,le0 ,u

it is #+e! !urin' manuactur it limits the current in a circu

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Variable Resistor

this $aries in the current o$olta'e

it is use! as the $olumecontrol an! contrast an!tone controls

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T.pes o Resistorsaccor!in' to

Resisti$e Elements3se!

4

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1. Carbon composition

resistor

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2. Metal glaze resistor

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3. Glass-tin oxide resistor

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4. Precision ire-o!nd

resistor

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Po"er Ratin' o aResistor

11

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Poer Rating o" a Resistor

is a ph.sical propert.!epen!in' on the resistconstruction0 especiall.the ph.sical si9e

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Factors #$ectingt%e &attage o"

Resistors

1-

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Factors #$ecting t%e &attage

Resistors1):ar'er ph.sical si9e in!icates a hi'her po"

ratin')

2)Hi'her "atta'e resistor can operate at hi'

temperature)-);ire

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'e"ects o"Resistors

1

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'e"ects o" Resistors

1. (P)*.there is no

=o" o po"erin the entire

series path.the meter

pointer o anohmmeter "illnot mo$e

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'e"ects o" Resistors

2) C+#*G) V#,)

this e+cee!s the ma+imum an! minimutolerance percenta'e

such $alue means that the resistor is!eecti$e

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Color CodingC%art

16

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Color Coding C%art

To !etermine the $alues o car,on resistors

Interpret the our

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RESISTOR>S CO:OR CO?INCHART

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RESISTOR TO:ERANCE

the minimum an! ma+imum tolera,le $alue o a resi

E+ample

?etermine the color

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@i$e the si'ni#cant !i'its o thollo"in' color

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@IVE O3R CORRESPON?IN@ COVA:3ES O* THE *O::O;IN@

RESISTANCE VA:3ES1)58 F 18G2)) F G-)8) F G

)18 888 F 28G)21 888 888 F G