posted by Anonymous .
A toaster uses a Nichrome heating wire. When the toaster is turned on at 20°C, the initial current is 1.50 A. A few seconds later, the toaster warms up and the current has a value of 1.20 A. The average temperature coefficient of resistivity for Nichrome wire is 4.5 10-4 (C°)-1. What is the temperature of the heating wire?
In steady state, the resistance is higher by a factor 5/4 because the current is lower by a factor 4/5.
Calculate the temperature rise necessary to increase the resistance by 25%. usng the temperature coefficient of resisitivity.
That will be the answer
how do i do that