Question

) A coil has resistance of 50-
at
15€
and 58
at 55°C.
Find the
resistance temperature coefficient at
a) 0°c b) 15°​

Answer 1

Answer:

We know that RT=R0(1+αT)  where RT= resistance at temp T, R0= resistance at temp T=0oC and α= temperature coefficient of resistance.

Here, 5=R0(1+α.50)...(1)

and 7=R0(1+α.100)...(2)

(2)/(1)⇒57=1+50α1+100α

7+350α=5+500α

150α=2⇒α=2/150=0.013/oC