P27_025.PDF

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Chapter 27 - 27.25
25. The resistance at operating temperature T is R = V/i =2 . 9V / 0 . 30A = 9 . 67Ω. Thus, from R
−
R 0 =
R 0 α ( T
−
T 0 ), we find
1
=20 ◦ C+ 1
4 . 5
R
R 0 −
9 . 67Ω
1 . 1Ω −
1
×
10 − 3 / K
which yields approximately 1900 ◦ C. Since a change in Celsius is equivalent to a change on the Kelvin
temperature scale, the value of α used in this calculation is not inconsistent with the other units involved.
Table 27-1 has been used.
T = T 0 + 1
α
 

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