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1 Electricity For The Electrical Trades - Multisim Activities Manual Answers To Simulations
Section 1 – Fundamentals of Electricity
CHAPTER 1 SAFETY
1-1 (a) 0.12 A or 120 mA (b) To be completed by the student (c) 0.120 A
CHAPTER 2 ATOMS AND ELECTRICITY
2-1 (a) To be completed by the student (b) Bad because the light does not come on (c) Fuse F4 is blown and fuses F2 and F3 are OK
CHAPTER 3 SOURCES AND CHARACTERISTICS OF
ELECTRICITY
3-1 (a) AC because the value of the voltage varies in amplitude and polarity (b) DC because the amplitude and polarity of the voltage remains the same.
CHAPTER 4 ELECTRICAL QUANTITIES AND OHM'S LAW
4-1 (a) To be completed by the student (b) Series (c) 2.5 A
4-2 (a) To be completed by the student (b) Parallel (c) 12 VDC – supply 12 VDC – load
4-3 R1 = 5 Ω
R2 = 20 Ω
R3 = 1.5 k Ω (Electricity for the Trades, 3e Frank Petruzella) (Solution Manual, For Complete File, Download link at the end of this File) 1 / 4
2 4-4 (a) 1 A (b) 2 A (c) The connection with the 10V applied because the higher applied voltage results in a greater current flow.4-5 (a) 60 Watts (b) 120 V , 0.5 A, 60 W
4-6 (a) 12 A (b) 12 A (c) 6 A (d) 6 A (e) 24 A (f) 24 A
4-7 (a) 6 A (b) 6 A (c) 12 A (d) 12 A (e) 3 A (f) 3 A
CHAPTER 5 SIMPLE, SERIES, AND PARALLEL CIRCUITS
5-1 (a) 5A into and 5A out of (b) The current flow into the lamp is the same value as the current flow out of the lamp.(c) 12V (d) The voltage across the lamp is the same value as the source voltage.
5-2 (a) Series connection is used.(b) The two lamps have the same voltage and power ratings.(c) 120 V is across each lamp.(d) Each lamp receives one half of the source voltage.(e) 2.491 A, 2.491 A, 2.491 A, (f) The current is the same value at all three points.(g) No because the current path through L1 is opened.
5-3 (a) Parallel connection is used.(b) The two lamps have the same voltage and power ratings. 2 / 4
3 (c) 240 V, 240V (d) Each lamp voltage is the same as that of the source.(e) Line current is 5 A, L1 current is 2.5 A, L2 current is 2.5 A (f) The line current is divided equally between the two lamps.(g) Yes because each lamp acts independent of the other.5-4 (a) Series (b) To be completed by the student (c) To be completed by the student (d) Lamp burns open
5-5 (a) Switches B and C in parallel with each other and this combination in series with switch A.(b) To be completed by the student (c) To be completed by the student
5-6 (a) Series (b) L3 is burnt out.
5-7 (a) 12V across the switch and 0V across each lamp.(b) 0V across the switch and 4V across each lamp.(c) When the circuit is complete each lamp receives 1/3 of the applied voltage.
5-8 (a) Voltage across resistor is 114.285 volts.Voltage across lamp is 5.715 volts.(b) The resistor has the higher resistance because when the circuit is operated the voltage drop across the resistor is much higher than that across the lamp and the resistance is directly related to the voltage.
5-9 (a) Voltage across L1 is 6 volts Voltage across L2 is 6 volts.(b) The value of the source voltage is 6 volts because in a parallel circuit the source voltage is the same as that across each of the loads.
5-10 (a) 8.328 A (b) 3.332 A (c) The 40W lamp because it draws less current when the same amount of voltage is applied.
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4 5-11 (a) To be completed by the student (b) To be completed by the student (c) The other two lamps turn off because the current path to the other lamps is opened.
5-12 (a) To be completed by the student (b) To be completed by the student (c) No effect because the current paths to the other lamps are maintained.
5-13 (a) To be completed by the student (b) To be completed by the student
(c) SWITCHES LAMP
A B
OFF OFF OFF
OFF ON OFF
ON OFF OFF
ON ON ON
5-14 (a) To be completed by the student (b) To be completed by the student
(c) SWITCHES LAMP
A B
OFF OFF OFF
OFF ON ON
ON OFF ON
ON ON ON
5-15 (a) To be completed by the student
(b) SWITCHES LAMPS
A B X Y
OFF OFF OFF OFF
OFF ON OFF OFF
ON OFF OFF ON
ON ON ON ON
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