Answered: 2.1.A piece of copper wire has a…

2.1.A piece of copper wire has a resistance of 5 : at 20°C. What is its resistance at 100°C? 2.2. If the resistance of a length of copper wire is 7 at 20°C, calculate the resistance at 60°C.

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter12: Electronic Control Devices

Section: Chapter Questions

Problem 14RQ

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Photoelectric

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).

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2.1.A piece of copper wire has a resistance of 5 : at 20°C. What is its resistance at 100°C?

2.2. If the resistance of a length of copper wire is 7 at 20°C, calculate the resistance at 60°C.

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