A copper wire has a resistance of 2.5 ohms. What will be the resistance of a silver wire having a diameter half of the copper wire and length of one-fourth of the copper wire? Provided that the resistivity of the silver wire is 25 times that of the copper wire. Answer in one decimal place only

A copper wire has a resistance of 2.5 ohms. What will be the resistance of a silver wire having a diameter half of the copper wire and length of one-fourth of the copper wire? Provided that the resistivity of the silver wire is 25 times that of the copper wire. Answer in one decimal place only

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

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter13: Heating Control Devices

Section: Chapter Questions

Problem 28RQ

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Concept explainers

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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