Electrical Wiring: Residental - With Plans (Paperback) Package
18th Edition
ISBN: 9781305416376
Author: MULLIN
Publisher: Cengage
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Chapter 1, Problem 31R
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: Residental - With Plans (Paperback) Package
Ch. 1 - What is the purpose of specifications?Ch. 1 - Refer to the specifications in the back of this...Ch. 1 - What is done to prevent a plan from becoming...Ch. 1 - Name three requirements contained in the...Ch. 1 - Prob. 5RCh. 1 - What phrase is used when a substitution is...Ch. 1 - What is the purpose of an electrical symbol?...Ch. 1 - Prob. 8RCh. 1 - Prob. 9RCh. 1 - What three parties must be satisfied with the...
Ch. 1 - Prob. 12RCh. 1 - Prob. 13RCh. 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. 17RCh. 1 - Prob. 18RCh. 1 - Does compliance with the NEC always result in an...Ch. 1 - Name two nationally recognized testing...Ch. 1 - Prob. 21RCh. 1 - Prob. 23RCh. 1 - A junction box on a piece of European equipment is...Ch. 1 - Prob. 25RCh. 1 - You will learn in Chapter 3 that residential...Ch. 1 - Prob. 27RCh. 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. 32RCh. 1 - What do the letters PPE stand for?...Ch. 1 - Prob. 34RCh. 1 - Where might you obtain information about...Ch. 1 - Prob. 36R
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- 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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