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, . , .
. :R = * / , R : : : :
. :R1 = R2 * [1 + * ( 2 1 )] , R1, R2: 1 2 . : , .
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: ) , . ) , . ) , , . ( Fixed Resistors) (Carbon Resistors) : ( ) ( ) . : , , . , , . , . , .
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(Carbon Film Resistors)
: . , . , . , .
1. : . , . , . , . , . , . , . , . , . 2, 3 : ) , ) *
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(Metal Film Resistors) : . .
1., 2. , 3. , 4. (Wire wound Resistors) . , . :. - . - . , .
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1.2 : ) , ) , 3. *
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(Variable Resistors) (Adjustable Resistors) , .
1. .
2. . 3.
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- (Potensiometers) : . : ( ) ( ). , . : - . . . , .. , . : , .*
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1. : ) , ) , ) . 2.3.
. 4. .
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( Adjusting Resistors) : . : . , . , , , . N.T.C (Negative Temperature Coefficient Thermistors) : , . : . , .
1. N.T.C . 2.3. : ) P.T.C ) N.T.C*
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P.T.C. (Positive Temperature Coefficient Thermistor) : N.T.C , . .
(LDR Resistors) : . (CdS). , , , 1M 100. , 1000 . , . -(ON-OFF), .
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(VDR Resistors) : . . , , , . , . VDR . , , ...
1.2 . L.D.R . 3.4.V.D.R .5. - (R) V.D.R
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) R=540, d=0,2mm;
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: R = * / : = * R /
() d=0,2mm :
= * r2 /4 = 3.14 * (0.2)2 /4 = 0.031 mm2
: = * R / = 0.031 * 540 / 1.1 = 15.21 m
, 15.21 .
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( =0,00025) 1=20C R20=540. R120=120C; :
R120= R20[1+0,00025(120-20)=540(1+0,00025100)=553,5 , , , 100 C 13,5.
0 (-273 C), ( ), , .
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: 1 = 15.21 m 2 = 30.42 m : d = 0.2 mm. : p = 1.1 m. ; :
: R = * / :
, () d=0,2mm :
= * r2 /4 = 3.14 * (0.2)2 /4 = 0.031 mm2 : R1 = * 1 / = 1.1 * 15.21 / 0.031 ~ 540 R2 = * 2 / = 1.1 * 30.42 / 0.031 ~ 1.5
: . .
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