a. Verify the value of α20 for copper in Table by substituting the inferred absolute temperature into Eq. (1).
b. Using Eq. (2) find the temperature at which the resistance of a copper conductor will increase to 1 from a level of 0.8 Ω at 20°C.
Temperature coefficient of resistance for various conductors at 20°C
|
|
Material
|
Temperature
Coefficient (a20)
|
|
Silver
|
0.0038
|
|
Copper
|
0.00393
|
|
Gold
|
0.0034
|
|
Aluminum
|
0.00391
|
|
Tungsten
|
0.005
|
|
Nickel
|
0.006
|
|
Iron
|
0.0055
|
|
Constantan
|
0.000008
|
|
Nichrome
|
0.00044
|
