Page 123 - Electrician -1st Year - TT

• LPj§ ùTôÚ°u RuûU«Ûm Es[Õ. NUuTôÓ (i) XõÚkÕ Sôm A±YÕ
R = R (1+ t) .....(ii)
G]úY (R R ) R t .....(i) T o
t o o
(BpTô) GuTÕ BWmT ùYlT¨ûX«p
CÕ (BpTô) GuTÕ ¨ûXVô]Õ,
Nôok§ÚlTRôp JÚ ùLôÓdLlThP
CRû]jRôu ªuRûP«u ùYlT¨ûX ùYlT¨ûX«p ªuRûP ùYlT¨ûX ÏQLm
ÏQLm (temperature coefficient) G]
GuTÕ 1°C «p ùYlT¨ûX Uôt\j§p
AûZd¡ú\ôm.
ªuRûP«p Utßm Km A[®p
CfNUuTôÓ (i) I, úYß®RUôLÜm UôßYRôÏm.
AûUjRôp ùTßYÕ
JÚ úYû[ R ùLôÓdLlTPô®¥p t °C
o 1
ùYlT¨ûX«p Es[ RûP R dÏm, ùR¬VôR
1
R RûP t °C ùYlT¨ûX«p Es[ ùRôPo×
2 2
¸rLiPYôß LiP±VXôm.
If R = 1 , t = 1 C,
o
o
R = R (1 + t ) Utßm R = R (1 + t ).
©u = R = R R . 2 o o 2 1 o o 1
t o
G]úY, EúXôLj§u ªuRûP ùYlT¨ûXd BûLVôp
ÏQLjûR 0°C ùYlT¨ûX«p JÚ Km
ªuRûP ùLôiP LPj§ 0°C XõÚkÕ 1°C CûQ ªuRûP (Resistivities) Utßm
ùYlT¨ûX EVoÜdÏ UôßTÓm ªuRûP ùYlT¨ûX ÏQLm B¡VYt±u ®TWeLs
Uôt\úU, AdLPj§«u ùYlT¨ûX ÏQLm ¸úZÙs[ AhPYûQ«p ùLôÓdLl
(temperature coefficient) Guß YûWVßdLl ThÓs[].
TÓ¡\Õ.

CûQ ªuRûP Utßm ùYlT¨ûX ÏQLm B¡VYt±u ®YWeLs

ùTôÚhLs ùYlTÏQLm
EúXôLeLs -LXûY Resistivity in ohm-metre at (Temperature coefficient at
0
0
–4
EúXôLeLs 20 C x 10 –8 20 C x 10 )
AÛª²Vm (Aluminimum ) 2.8 40.3
©jRû[ 6 8 20
LôoTu 3000 7000 (5)

LôuvhPuh (constant) 49 (+0.160 0.4)

(A) ÙúWLô
LôlTo ( annealed) 1.72 39.3
ù_oUu £pYo 20.2 2.7
CÚm× 9.8 65

úUeL²u (84% Cu; 25% Mn; 4% Ni) 44 48 0.15
ùUoϬ 95.8 8.9
¨dúWôm (60% Cu;25% Fe;15% Cr) 108.5 1.5

¨dLp 7.8 54
©[ôh¥]m 9 15.5 36.7
£pYo 1.64 38

PevPu 5.5 47

TYo : GXdh¬μVu (NSQF - Revised 2022) R.T. Ex.No. 1.3.35 & 36 103