Question

the temp coefficient of resistance of wire is 12.5/10000 °c. at 300k the resistance of the wire is 1 ohm. the resistance will be 2 ohm at?

Answer 1

Let the temperature at which the resistance is 2 ohms is T.

 

Now, at 300K , resistance is 1 ohm it is given.

 

So, the temperature difference will be T-300

 

therefore, 2=1(1+0.00125*(T-300))

 

so, 2 = 1 + 0.00125T - 0.375

so, 1.375 = 0,00125 T

hence T = 1.375/0.00125 - 1100 Kelvin