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RESISTANCE
What does current encounter when flowing through a con ductor ?
2. Explain Figure 8.
3. At what point does a water pipe reach it> normal capacity?
4. If a water pipe be overloaded what will be the result?
5. Basing your answer on what has been said about water
pipes, what is it that increases or decreases resistance in an electric circuit ?
6. Is there any relation between voltage and wire diameters ? > v^4
7. Could a wire the diameter of a silk thread be charged at
40,000 volts?
8. How much power would one-half ampere at 40,000 volts
represent ?
9. How much power would 40,000 amperes at 0.5 of an «npere
represent ? i
10. To what is resistance to current flow due?
11. Do different metals offer different resistances to current flow ?
12. Taking the resistance of pure annealed copper a 1, name
the resistances of silver and commercial copper. -w/j
13. Working at or under normal capacity, is rise in temperature
of copper wire perceptible to us through physical contact ?
14. What determines the normal capacity of copper wires?
15. What will happen if circuit wires are overloaded ? Are over
loaded circuits expensive and dangerous?
Resistance and Temperature, page 36
16. In what conductor does resistance decrease as temperature
rises? rw ) •
17. Compare the resistance of carbon lamp filament when cold
and hot.
18. To what is increase and decrease in resistance proportional ?
19. Upon what basic temperature are all resistance calculations
based ?
20. For what is the temperature coefficient used?
21. Upon what basis are resistance tables constructed?