ELECTRICAL WIRING:RESIDENTAL-6 PLANS
18th Edition
ISBN: 9781305098329
Author: MULLIN
Publisher: CENGAGE L
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Textbook Question
Chapter 1, Problem 20R
Are low-voltage systems totally safe? Explain.
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1. The terms “open-circuit", “short circuit" and “dead short" are used in speaking
electricity. Answer the following questions about these three terms:
a. What is the value of the resistance of an open circuit?
b. What is the value of the resistance of a short circuit?
c. What is meant by a “dead short"?
5
DDPasalo-Electrical Engineering Department COE MMSU
EE 121: Electrical Circuits I
2. When a switch is open, is the resistance between its terminals high or low? ¸Low
3. What is the resistance of a closed switch (ideally)?
4. Using each of the methods shown in (a) and (b) below, calculate the value of the
equivalent resistance of a combination of R1 = 5 ohms and R2 = 20 ohms connected
in parallel
a. Using the equation: 1/Requivalent = 1/R, + 1/R2 + 1/R3 =
b. Using the equation: Requivalent = (R, x R2) / (R, + R2) =
Ω
5 a) Discuss Electricity power generation and distribution to residential properties.
b) with diagrams explain how a Distribution Board is wired to provide electricity to a residential property.
c) Explain the following materials and Accessories.
i. Male and female bushings. ii male and female adaptors iii. Couplings. iv. Wire/cable sizes and their us
Calculate the following. a) Expected voltage at “A” with switch SW1 open. b) Expected voltage at “A” with switch SW1 closed.
Chapter 1 Solutions
ELECTRICAL WIRING:RESIDENTAL-6 PLANS
Ch. 1 - Prob. 1RCh. 1 - Prob. 2RCh. 1 - Does the NEC provide minimum or maximum standards?...Ch. 1 - What do the letters UL signify?Ch. 1 - What section of the NEC states that all listed or...Ch. 1 - Prob. 6RCh. 1 - Prob. 7RCh. 1 - Does compliance with the NEC always result in an...Ch. 1 - Name two nationally recognized testing...Ch. 1 - Prob. 10R
Ch. 1 - Prob. 12RCh. 1 - A junction box on a piece of European equipment is...Ch. 1 - Prob. 14RCh. 1 - You will learn in Chapter 3 that residential...Ch. 1 - Prob. 16RCh. 1 - What can you do to reduce or eliminate the...Ch. 1 - What is the NEC definition of a qualified person?Ch. 1 - Are low-voltage systems totally safe? Explain.Ch. 1 - Prob. 21RCh. 1 - What do the letters PPE stand for?...Ch. 1 - Prob. 23RCh. 1 - Where might you obtain information about...Ch. 1 - Prob. 25R
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