Chapter 3, Problem 22P

The resistance of a copper wire is $\text{25}\text{mΩ}$ at a temperature of $\text{70°F}\text{.}$

1. What is the resistance if the temperature drops $\text{10°}$
2. to $\text{60°F?}$
3. What is the resistance if it drops an additional $\text{10°}$
4. to $\text{50°F?}$
5. Noting the results of parts (a) and (b), what is the drop for each part in milliohms? Is the drop in resistance linear or nonlinear? Can you forecast the new resistance if it drops to $\text{40°F,}$
6. without using the basic temperature equation?
7. If the temperature drops to $\text{-30°F}$
8. in northern Maine, find the change in resistance from the room temperature level of part (a). Is the change significant?
9. If the temperature increases to $\text{120°F}$
10. in Cairns, Australia, find the change in resistance from the room temperature of part (a). Is the change significant?