   Chapter 17, Problem 62AP

Chapter
Section
Textbook Problem

A Nichrome heating element in an oven has a resistance of 8.0 Ω at 20.0°C. (a) What is its resistance at 350°C? (b) What assumption did you have to make to obtain your answer to part (a)?

(a)

To determine
The resistance of nichrome wire at 350°C .

Explanation

Given Info: The resistance of nichrome wire at 20.0°C is 8.0Ω .

Explanation:

Formula to calculate the resistance is,

R=R0(1+α(TT0))

• R is the resistance at temperature T
• R0 is the resistance at some reference temperature T0
• α is the temperature coefficient of resistivity of nichrome

Substitute 8.0Ω for R0 , 0.4×103(°C)1 for α , 350°C for T and 20

(b)

To determine
The assumption made to obtain the answer on part (a).

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