Electrical Wiring Residential
19th Edition
ISBN: 9781337101837
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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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
How is voltage regulation achieved in a power system?
State and explain Paschen’s law. How do you account for the minimum voltage for breakdown under a given pd condition?
Chapter 1 Solutions
Electrical Wiring Residential
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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- 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 usarrow_forwardOhm's Law states that the electric current flowing though a ________ is directly proportional to the ________. Select one: a. closed circuit --- total resistance b. closed circuit --- switch resistance c. open circuit --- supply voltage d. closed circuit --- supply voltagearrow_forwardShort circuit is occurred when: Select one: a. The voltage between the two terminals is zero although there may be a nonzero current between the terminals. b. All of the given answers. c. There will be a zero-resistance connection between terminal A and B and therefore the 2 terminals are at the same voltage. d. A pair of terminals connected by a wire (of zero resistance).arrow_forward
- A computer's power supply converts mains AC to low-voltage regulated DC power for the internal components of a computer. You are building a new computer. You are deciding which type of power supply to install. Which of the following definitions BEST describes a valid type of power supply? Correct Answer: A single-rail power supply provides one rail (PCB trace). This provides the best safety for the computer by providing a single point of shutdown in the event of a short circuit. Correct Answer: A single-rail power supply provides one rail (PCB trace) used to always provide equal wattage to all devices attached to the power supply. Correct Answer: A dual-rail power supply provides separate rails (PCB traces) used to provide equal wattage to the devices attached to each rail. Correct Answer: A dual-rail power supply provides separate rails (PCB traces) used to balance the power load between multiple circuits, which prevents any one circuit from becoming overloaded.arrow_forwardPower engineering book Mehtaarrow_forwardWhat is the relation between “equivalent circuits” seen from any terminals and the maximum “power transfer into a load” attached to the same terminals of interest? (one single sentence is enough to explain it)arrow_forward
- What is the significance of voltage regulation in a power system?arrow_forwardPlease answer these questions, I would like it if it's not too detailed yet not too easy. Questions: What gases are used in a light bulb?What instrument do we use to measure current? What units do we use when we measure current?Describe the working of a doorbell.What are Maglev trains? How do they run?What effect does electric current have on chemicals?Where describe is written, please make it a bit detailed. Thank you very much and yes it is a big urgent.arrow_forward4.arrow_forward
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