(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A platinum wire is originally at 15 degree Celcius. Find the required temperature to increase its resistance by 3%.

2. Relevant equations

R = Ro * [1 + 'a' * (T-To)]

Ro is initial resistance. To is initial temperature.

'Temperature Coefficient' 'a' of platinum at room temperature 20 degree celcius is 3.9 * 10^-3

3. The attempt at a solution

I don't have an initial resistance to start off with. But I do have the initial temperature and the room temperature, To = 15 and T = 20 degree Celcius.

Solving for Temperature T = ('a'To + R/Ro) / 'a'

But I don't have any reference resistance to begin with, how do I solve this?

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Temperature to raise resistance

**Physics Forums | Science Articles, Homework Help, Discussion**