Page 124 - Electrician -1st Year - TT

ùYlTÏQLm 20°C «p
Resistivity in Km -- ÁhPo (Temperature coefficient 20°C)
CuÑúXhPoLs
20°C «p
AmTo 5 x 10 14

úTdLûXh 10 10
LiQô¥ 10 10 10 12 10 12

ûULô 10 15
WlTo 10 16

ùNpXôd 10 14
Np@To (LkRLm) 10 15

ERôWQm (Example) : JÚ Lô«Xõu ªuRûP 13 1+75α 0
25°C p 55 KmL[ôLÜm 75°C p 65 KmL[ôLÜm 11 = 1+ 25α
Es[Õ. CkR LPj§«u ªuRûP 0
ùYlT¨ûX ÏQLm 0°C ¨ûX«p ÏßdÏ ùTÚd¡]ôp
LiÓ©¥dLÜm. 13[1 + 25 ] = 11[1 + 75 )
o o
R = R (1 + t) 13 + 325 = 11 + 825
t o o o o
R = 55 = R (1 + 25 ) .....Eqn.1 13 11 = 825 325
25 o o o o
R = 65 = R (1 + 75 ) .....Eqn.2 2 = 500
75 o o o
NUuTôÓ 2 I NUuTôÓ 1 Bp YÏjRôp 2
= = 0.004 per C. .
o
o 500
R 75 = 65 = 1+75α 0
R 25 55 125α+ 0

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