A- If the resistance of an aluminum wire at room temperature (20 C°) is 100 m2; at what temperature will its resistance increase to 120 m2? (Aluminum Temperature coefficient 0.0039 lat room temperature).

A- If the resistance of an aluminum wire at room temperature (20 C°) is 100 m2; at what temperature will its resistance increase to 120 m2? (Aluminum Temperature coefficient 0.0039 lat room temperature).

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

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter16: Installation Of Heating, Cooling, And Refrigeration Systems

Section: Chapter Questions

Problem 2RQ

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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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A- If the resistance of an aluminum wire at room temperature (20 C°) is 100 m2; at
what temperature will its resistance increase to 120 m2? (Aluminum Temperature
coefficient 0.0039 lat room temperature).

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