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?