Answered: Problem 5. Calculate the…

Problem 5. Calculate the cross-sectional area, in mm², of a piece of copper wire, 40 m in length and having a resistance of 0.25 2. Take the resistivity of copper as 0.02 x 10-6 m.

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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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).

Question

Resistance of the wire given, you have to find cross section area.

Problem 5. Calculate the cross-sectional area, in
mm², of a piece of copper wire, 40m in length and
having a resistance of 0.25 2. Take the resistivity of
copper as 0.02 × 10-6 m.

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