Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN: 9781337399128
Author: Russell E. Smith
Publisher: Cengage Learning
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Textbook Question
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Chapter 7, Problem 1RQ

Alternating current is __________.

  1. a. an alternating flow of electrons
  2. b. electrons reversing their flow at regular intervals
  3. c. the most commonly used current
  4. d. all of the above
Expert Solution & Answer
Check Mark
To determine

Alternating current is

Explanation of Solution

Alternating current is the flow of electric charge in both positive and negative directions.

In other words, the flow of electric charge which shifts its direction with respect to time is known as alternating current.

Hence, the correct answer is “option d. all the above”.

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34- Energies of the electromagnetic radiation in the visible range of light (white light) vary between 1.8 eV (red light) and 3.1 eV (blue light). If white light impinges (hit) on the surface of a non-conducting material having Egap-2.5 eV, which one of the following is observed? All the electromagnetic radiation is absorbed by the material. A- Partial absorption of visible light happens, and the material is colored. All the electromagnetic radiation is reflected on the surface of the material. None of the electromagnetic radiation is absorbed, and the material is transparent. B- C- D- E- None of the choices above are correct.
No need to explain. Just please answer the 2 questions, thank you.
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