a.a. Which of the following statements about grounding electrode conductors is true? A. They restrict the ground connection. B. They eliminate potential differences between conductive objects and the Earth electrode. C. They facilitate operation of overcurrent protective devices. D. They perform bonding between the Earth and grounded conductors. a.b. Which of the following formulas would you use to find current? A. R = E ÷ I B. I = R × E C. I = E ÷ R D. E = I × R

a.a. Which of the following statements about grounding electrode conductors is true? A. They restrict the ground connection. B. They eliminate potential differences between conductive objects and the Earth electrode. C. They facilitate operation of overcurrent protective devices. D. They perform bonding between the Earth and grounded conductors. a.b. Which of the following formulas would you use to find current? A. R = E ÷ I B. I = R × E C. I = E ÷ R D. E = I × R

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 1RQ

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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

a.a. Which of the following statements about grounding electrode conductors is true?
A. They restrict the ground connection.
B. They eliminate potential differences between conductive objects and the Earth electrode.
C. They facilitate operation of overcurrent protective devices.
D. They perform bonding between the Earth and grounded conductors.

a.b. Which of the following formulas would you use to find current?
A. R = E ÷ I
B. I = R × E
C. I = E ÷ R
D. E = I × R

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