14. Resistors
Transcript of 14. Resistors
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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
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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 #$ectingt%e &attage o"
Resistors
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Factors #$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
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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
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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