A toaster using a Nichrome heating element operates on 120 V.
When it is switched on at 20°C, the heating element carries an initial
current of 1.35 A. A few seconds later the current reaches the
steady value of 1.23 A. (a) What is the final temperature of the element?
The average value of the temperature coefficient of resistivity
for Nichrome over the relevant temperature range is 4.5 *10-4 1C°2-1.
(b) What is the power dissipated in the heating element
initially and when the current reaches 1.23 A?

Question

A toaster using a Nichrome heating element operates on 120 V.
When it is switched on at 20°C, the heating element carries an initial
current of 1.35 A. A few seconds later the current reaches the
steady value of 1.23 A. (a) What is the final temperature of the element?
The average value of the temperature coefficient of resistivity
for Nichrome over the relevant temperature range is 4.5 *10-4 1C°2-1.
(b) What is the power dissipated in the heating element
initially and when the current reaches 1.23 A?

anonymous · Answer

temp coff=4.5X10^-4

anonymous · Answer

$$R=R _{0} (1-\alpha(T-T _{0}))$$

anonymous · Answer

find R from the given steady state amperage (and voltage)
and Ro from the given initial amperage (and voltage)