ELECTRICITY FOR TRADES (LOOSELEAF)
3rd Edition
ISBN: 9781260437454
Author: Petruzella
Publisher: MCG
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Chapter 4.2, Problem 9RQ
a.
To determine
State the function of the power source in a circuit.
b.
To determine
State the function of the conductors in a circuit.
c.
To determine
State the function of the control device in a circuit.
d.
To determine
State the function of the protection device in a circuit.
e.
To determine
State the function of the load in a circuit.
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Additional Resources
Electronics Fundamentals: Circuits, Devices, and Applications,
Principles of Electric Circuits, Thomas L. Floyd. New York: Prent
3.0.0 Section Review
1. The letter designation SL on an electrical draw-
ing indicates a
4. A
a.
a. limit switch
b. low-voltage switch
c. load switch
d. light switch
b.
C.
d.
2. Existing power lines on an electrical site plan
may be indicated by the letter
5. In t
safe
a. E
b. I
a.
b. 2
С. Р
d. V
C. 2
d. 2:
3. The specific types of luminaires required in an
installation can be found on the
a. power plan
b. electrical site plan
c. schematic diagram
d. lighting fixture schedule
P Search for anything
it is the ratio of measured voltage to the measured current of an electrical load circuit.
A. Resistance
B. Hot resisitance
C. Cold resistance
D. infinite Resistance
QUESTION -7 In the following figure a power line to drive a Load is represented. The wires are made of copper and shaped as solid round. Under the following requirementsi. The length of each positive voltage and ground wire is 30ft.ii. The maximum allowable resistance of each power line is 0.006 Ω.iii. The maximum allowable current is 110A for each power line.Find the followinga) Using the AWG table (given in this exam sheet) find the suitable cable type with minimum size.b) Considering power supply as E=24V and current drawn by the load as I=12A, find the total voltage drop over the cables and voltage difference over the Load.
Chapter 4 Solutions
ELECTRICITY FOR TRADES (LOOSELEAF)
Ch. 4.1 - What is the practical unit of electric charge?Ch. 4.1 - Prob. 2RQCh. 4.1 - Prob. 3RQCh. 4.1 - Explain what a current flow of 1 ampere can be...Ch. 4.1 - Account for the fact that electric current travels...Ch. 4.1 - Prob. 6RQCh. 4.1 - Prob. 7RQCh. 4.1 - Prob. 8RQCh. 4.1 - Prob. 9RQCh. 4.1 - Prob. 10RQ
Ch. 4.1 - Prob. 11RQCh. 4.1 - Prob. 12RQCh. 4.1 - What is the cause and effect of resistance?Ch. 4.1 - When using an ohmmeter to measure resistance, what...Ch. 4.1 - Convert the following data: a. 12,000 A to kA b....Ch. 4.1 - Prob. 16RQCh. 4.2 - Define electric power.Ch. 4.2 - What is the basic unit used to measure electric...Ch. 4.2 - A toaster draws 8 amperes when connected to a...Ch. 4.2 - Prob. 4RQCh. 4.2 - Prob. 5RQCh. 4.2 - Prob. 6RQCh. 4.2 - Prob. 7RQCh. 4.2 - Compare a closed and an open electric circuit.Ch. 4.2 - Prob. 9RQCh. 4.2 - What does Ohms law tell us about current flow in a...Ch. 4.2 - Ohms law is applied to a circuit using what three...Ch. 4.2 - Prob. 12RQCh. 4.2 - Prob. 13RQCh. 4.2 - Prob. 14RQCh. 4.2 - Prob. 15RQCh. 4.2 - Prob. 16RQCh. 4.2 - Prob. 17RQCh. 4.2 - Prob. 18RQ
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