Question

a wire has a resisitance of 7.5 ohm at 23 degree celcius and 15.7 ohm at 175 dagree celcius determine the temperature coefficient of resistance​

Answer 1

Answer:Using the relation :

R2=R1[1+α(T 2 −T 1 ]

Here,

R1=10.5Ω ; T1 =21°C

R2 =16.4Ω; T2 =147°C

Putting the values in the equation,

16.4=10.5[1+α(147−21)]

a= 4.45 ×10 −3 C −1