4. What is the resistance of a copper wire 200 ft long and0.016" in diameter (T = 20°C)?5. a. What is the area in circular mils of an aluminum con-ductor that is 80 ft long with a resistance of 2.5 N?b. What is its diameter in inches?

Answered: 4. What is the resistance of a copper…

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4. What is the resistance of a copper wire 200 ft long and 0.016" in diameter (T = 20°C)?

EBK ELECTRICAL WIRING RESIDENTIAL

19th Edition

ISBN:9781337516549

Author:Simmons

Publisher:Simmons

Chapter6: Ground-fault Circuit Interrupters, Arc-fault Circuit Interrupters, Surge Protective Devices, Immersion Detection Circuit Interrupters, And Appliance Leakage Current Interrupters

Section: Chapter Questions

Problem 26R

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The photoelectric effect occurs when light (or similar incident radiation, including X-rays) falls on material together with a metal plate and causes it to emit electrons. The discovery of the photoelectric effect led to important new theories (and to a Nobel Prize for Albert Einstein). Photoelectric cells, or photocells, are utilized in burglar-alarm light detectors and garage-door openers (each employs a through-beam of light this is broken when something movements throughout it), and also to play soundtracks on film movies (in which a light beam shines through the soundtrack encoded at the film and is "read" with the aid of the photocells).

Question

4. What is the resistance of a copper wire 200 ft long and
0.016" in diameter (T = 20°C)?
5. a. What is the area in circular mils of an aluminum con-
ductor that is 80 ft long with a resistance of 2.5 N?
b. What is its diameter in inches?

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