1. The problem statement, all variables and given/known data A toaster uses a Nichrome heating wire. When the toaster is turned on at 27 deg C, the initial current is 1.50A. A few seconds later, the toaster warms up and the current is now 1.30A. The avg. temp coefficient of resistivity for Nichrome wire is 4.5 x 10 ^ -4 (degree C) ^-1. What is the temperature of the heating wire? 2. Relevant equations Nichrome(alloy) p=100 x 10^-8 ohm*m. p = po [1 + alpha(T - To)] To=20 deg C. alpha=4.5x10^-4 (deg C)^-1 Io=1.50A I=1.30A T-? 3. The attempt at a solution My attempt. R = Ro [1 + alpha(T - To)] R - Ro = alpha(T-To) R=V/I T= V(1/I - 1/Io)/alpha + 20 T = 20 + V(227.72) V = (T-20)/227.92 T = 20 + (T-20/227.12) (227.12) The answer is 360 deg C btw.