Question

The resistance of a platinum wire at 30 degrees is 15 ohms. Find the resistance of 45 degrees.

Answer 1

Answer:

Rt=Ro(1+alpha∆T ) and firstly put Rt=15ohm and Ro= Ro and aplpha =0.0039 and ∆T=30-20 then 10 ,, 15=Ro(1+0.0039×10) this equation first second equation Rt = Ro {1+0.0039×(45-20)} thend divide both equation Ro cancel you got value of Rt at 45°c