subelement g5 electrical principles [3 exam questions – 3 groups]
TRANSCRIPT
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SUBELEMENT G5ELECTRICAL PRINCIPLES
[3 Exam Questions – 3 Groups]
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SUBELEMENT G5 ELECTRICAL PRINCIPLES [3 Exam Questions–3 Groups]
•G5A - Reactance; inductance; capacitance; impedance; impedance matching•G5B - The Decibel; current and voltage dividers; electrical power calculations; sine wave root-mean-square (RMS) values; PEP calculations•G5C – Resistors, capacitors, and inductors in series and parallel; transformers
2Electrical Principles 2010
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Resonate Circuit
3Elec. Princip.
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G5A01 - What is impedance?
A. The electric charge stored by a capacitorB. The inverse of resistanceC. The opposition to the flow of current in an AC circuitD. The force of repulsion between two similar electric fields
4Elec. Princip.
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G5A01 - What is impedance?
A. The electric charge stored by a capacitorB. The inverse of resistance
C. The opposition to the flow of C. The opposition to the flow of current in an AC circuitcurrent in an AC circuitD. The force of repulsion between two similar electric fields
5Elec. Princip.
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G5A02 - What is reactance?
A. Opposition to the flow of direct current caused by resistanceB. Opposition to the flow of alternating current caused by capacitance or inductanceC. A property of ideal resistors in AC circuitsD. A large spark produced at switch contacts when an inductor is de-energized
6Elec. Princip.
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G5A02 - What is reactance?
A. Opposition to the flow of direct current caused by resistance
B. Opposition to the flow of alternating B. Opposition to the flow of alternating current caused by capacitance or current caused by capacitance or inductanceinductanceC. A property of ideal resistors in AC circuitsD. A large spark produced at switch contacts when an inductor is de-energized
7Elec. Princip.
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G5A03 - Which of the following causes opposition to the flow of
alternating current in an inductor?
A. ConductanceB. ReluctanceC. AdmittanceD. Reactance
8Elec. Princip.
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G5A03 - Which of the following causes opposition to the flow of
alternating current in an inductor?
A. ConductanceB. ReluctanceC. Admittance
D. ReactanceD. Reactance
9Elec. Princip.
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G5A04 - Which of the following causes opposition to the flow of alternating
current in a capacitor?
A. ConductanceB. ReluctanceC. ReactanceD. Admittance
10Elec. Princip.
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G5A04 - Which of the following causes opposition to the flow of alternating
current in a capacitor?
A. ConductanceB. Reluctance
C. ReactanceC. ReactanceD. Admittance
11Elec. Princip.
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G5A05 - How does an inductor react to AC?
A. As the frequency of the applied AC increases, the reactance decreasesB. As the amplitude of the applied AC increases, the reactance increasesC. As the amplitude of the applied AC increases, the reactance decreasesD. As the frequency of the applied AC increases, the reactance increases
12Elec. Princip.
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G5A05 - How does an inductor react to AC?
A. As the frequency of the applied AC increases, the reactance decreasesB. As the amplitude of the applied AC increases, the reactance increasesC. As the amplitude of the applied AC increases, the reactance decreases
D. As the frequency of the applied AC D. As the frequency of the applied AC increases, the reactance increasesincreases, the reactance increases
13Elec. Princip.
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G5A06 - How does a capacitor react to AC?
A. As the frequency of the applied AC increases, the reactance decreasesB. As the frequency of the applied AC increases, the reactance increasesC. As the amplitude of the applied AC increases, the reactance increasesD. As the amplitude of the applied AC increases, the reactance decreases
14Elec. Princip.
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G5A06 - How does a capacitor react to AC?
A. As the frequency of the applied AC A. As the frequency of the applied AC increases, the reactance decreasesincreases, the reactance decreasesB. As the frequency of the applied AC increases, the reactance increasesC. As the amplitude of the applied AC increases, the reactance increasesD. As the amplitude of the applied AC increases, the reactance decreases
15Elec. Princip.
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G5A07 - What happens when the impedance of an electrical load is
equal to the output impedance of a power source, assuming both
impedances are resistive? A. The source delivers minimum power to the loadB. The electrical load is shortedC. No current can flow through the circuitD. The source can deliver maximum power to the load
16Elec. Princip.
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G5A07 - What happens when the impedance of an electrical load is
equal to the output impedance of a power source, assuming both
impedances are resistive? A. The source delivers minimum power to the loadB. The electrical load is shortedC. No current can flow through the circuit
D. The source can deliver D. The source can deliver maximum power to the loadmaximum power to the load
17Elec. Princip.
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G5A08 - Why is impedance matching important?
A. So the source can deliver maximum power to the loadB. So the load will draw minimum power from the sourceC. To ensure that there is less resistance than reactance in the circuitD. To ensure that the resistance and reactance in the circuit are equal
18Elec. Princip.
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G5A08 - Why is impedance matching important?
A. So the source can deliver maximum A. So the source can deliver maximum power to the loadpower to the loadB. So the load will draw minimum power from the sourceC. To ensure that there is less resistance than reactance in the circuitD. To ensure that the resistance and reactance in the circuit are equal
19Elec. Princip.
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20Elec. Princip.
Ohm’s Law and Power Calculations
E=Voltage (Volts)
I=Current (Amps)
R=Resistance (Ohms)
P=Power (Watts)
E
I R
P
I E
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Electrical Principles 201521
Ohm’s Law and Power CalculationsUnit Circles
V
O A
W
A VVV=Voltage (Volts)=Voltage (Volts)
OO=Resistance =Resistance (Ohms)(Ohms)
AA=Current (Amps)=Current (Amps)
WW=Power (Watts)=Power (Watts)
To solve for a value, cover it with your finger and solve the remaining formula
Voice Of America – VOLTAGE CIRCLE W A V - WATTAGE CIRCLE
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Electrical Principles 201522
Ohm’s Law and Power CalculationsUnit Circles
V
O A
W
A VVV=Voltage (Volts)=Voltage (Volts)
OO=Resistance =Resistance (Ohms)(Ohms)
AA=Current (Amps)=Current (Amps)
WW=Power (Watts)=Power (Watts)
To solve for a value, cover it with your finger and solve the remaining formula
Voice Of America – VOLTAGE W A V - WATTAGE CIRCLE
CIRCLE
E R I
P I E
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G5A09 - What unit is used to measure reactance?
A. FaradB. OhmC. AmpereD. Siemens
23Elec. Princip.
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G5A09 - What unit is used to measure reactance?
A. Farad
B. OhmB. OhmC. AmpereD. Siemens
24Elec. Princip.
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G5A10 - What unit is used to measure impedance?
A. VoltB. OhmC. AmpereD. Watt
25Elec. Princip.
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G5A10 - What unit is used to measure impedance?
A. Volt
B. OhmB. OhmC. AmpereD. Watt
26Elec. Princip.
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G5A11 - Which of the following describes one method of impedance matching between two AC circuits?
A. Insert an LC network between the two circuitsB. Reduce the power output of the first circuitC. Increase the power output of the first circuitD. Insert a circulator between the two circuits
27Elec. Princip.
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G5A11 - Which of the following describes one method of impedance matching between two AC circuits?
A. Insert an LC network between the A. Insert an LC network between the two circuitstwo circuitsB. Reduce the power output of the first circuitC. Increase the power output of the first circuitD. Insert a circulator between the two circuits
28Elec. Princip.
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G5A12 - What is one reason to use an impedance matching
transformer?
A. To minimize transmitter power outputB. To maximize the transfer of powerC. To reduce power supply rippleD. To minimize radiation resistance
29Elec. Princip.
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G5A12 - What is one reason to use an impedance matching
transformer?
A. To minimize transmitter power output
B. To maximize the transfer of powerB. To maximize the transfer of powerC. To reduce power supply rippleD. To minimize radiation resistance
30Elec. Princip.
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G5A13 - Which of the following devices can be used for impedance
matching at radio frequencies?
A. A transformerB. A Pi-networkC. A length of transmission lineD. All of these choices are correct
31Elec. Princip.
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G5A13 - Which of the following devices can be used for impedance
matching at radio frequencies?
A. A transformerB. A Pi-networkC. A length of transmission line
D. All of these choices are D. All of these choices are correctcorrect
32Elec. Princip.
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G5B - The Decibel; current and voltage dividers; electrical power calculations;
sine wave root-mean-square ( RMS ) values; PEP calculations
33Elec. Princip.
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34Elec. Princip.
Decibel Multipliers
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
Decibel (dB)
Mu
ltip
lier
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G5B01 - What dB change represents a two-times increase or
decrease in power?
A. Approximately 2 dBB. Approximately 3 dBC. Approximately 6 dBD. Approximately 12 dB
35Elec. Princip.
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G5B01 - What dB change represents a two-times increase or
decrease in power?
A. Approximately 2 dB
B. Approximately 3 dBB. Approximately 3 dBC. Approximately 6 dBD. Approximately 12 dB
36Elec. Princip.
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
Decibel (dB)
Mu
ltip
lier
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37Elec. Princip.
RMS, Peak and Peak to Peak Voltages
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G5B02 - How does the total current relate to the individual currents in each branch of a purely resistive
parallel circuit?
A. It equals the average of each branch currentB. It decreases as more parallel branches are added to the circuitC. It equals the sum of the currents through each branch D. It is the sum of the reciprocal of each individual voltage drop
38Elec. Princip.
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G5B02 - How does the total current relate to the individual currents in each branch of a purely resistive
parallel circuit?
A. It equals the average of each branch currentB. It decreases as more parallel branches are added to the circuit
C. It equals the sum of the currents C. It equals the sum of the currents through each branch through each branch D. It is the sum of the reciprocal of each individual voltage drop
39Elec. Princip.
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G5B03 - How many watts of electrical power are used if 400 VDC is supplied to
an 800 ohm load?
A. 0.5 wattsB. 200 wattsC. 400 wattsD. 3200 watts
40Elec. Princip.
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Electrical Principles 201041
G5B03 How many WATTS of electrical power are used if 400 VDC is supplied to
an 800-ohm load?
V
O A
W?
A VVV=Voltage (Volts)=Voltage (Volts)
OO=Resistance =Resistance (Ohms)(Ohms)
AA=Current (Amps)=Current (Amps)
WW=Power (Watts)=Power (Watts)
1. What are you looking for? Watts
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Electrical Principles 201042
G5B03 How many watts of electrical power are used if 400 VDC is supplied to an
800-ohm load?
V V
400 V400 V
O O
800 800 ΩΩ
A
W ?
A V
400 VVV=Voltage (Volts)=Voltage (Volts)
OO=Resistance =Resistance (Ohms)(Ohms)
AA=Current (Amps)=Current (Amps)
WW=Power (Watts)=Power (Watts)
2. What do you know? Put it on the circles
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Radio and Electronic Fundamentals43
G5B03 How many watts of electrical power are used if 400 VDC is supplied
to an 800-ohm load?
400 V
A800 Ohms
STEP 3 - Find A A = V / O
A = 400V / 800Ω = 0.5A
3. Solve the Ohms Law Circle
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Radio and Electronic Fundamentals44
G5B03 How many watts of electrical power are used if 400 VDC is supplied
to an 800-ohm load?
W
0.5 A
400 V
STEP 4 - Find WW = A x V
W = 0.5 A x 400 V = 200 W
4. Moves the Amps value to the Watts Circle
Solve the Watts Circles
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G5B03 - How many watts of electrical power are used if 400 VDC is supplied to
an 800 ohm load?
A. 0.5 watts
B. 200 wattsB. 200 wattsC. 400 wattsD. 3200 watts
45Elec. Princip.
P
I E
E=Voltage (Volts)
I=Current (Amps)
R=Resistance (Ohms)
P=Power (Watts)
E
I R
400 VDC
400 VDC800 Ω
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G5B04 - How many watts of electrical power are used by a 12
VDC light bulb that draws 0.2 amperes?
A. 2.4 wattsB. 24 wattsC. 6 wattsD. 60 watts
46Elec. Princip.
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Electrical Principles 201047
G5B04 How many WATTS of electrical power are used by a 12-VDC light bulb that
draws 0.2 amperes?
W ?
A VW = A x V
1. What are you looking for? Watts
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Electrical Principles 201048
G5B04 How many watts of electrical power are used by a 12-VDC light bulb that
draws 0.2 amperes?
W ?
0.2 A 12 VW = A x V
2. What do you know? Put it on the circles
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Electrical Principles 201049
G5B04 How many watts of electrical power are used by a 12-VDC light bulb that draws
0.2 amperes?
W
0.2 A
12 V
W = A x VW = A x V
W = 0.2 A x 12 V = W = 0.2 A x 12 V = 2.4 W2.4 W
3. Solve for Watts
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G5B04 - How many watts of electrical power are used by a 12
VDC light bulb that draws 0.2 amperes?
A. 2.4 wattsA. 2.4 wattsB. 24 wattsC. 6 wattsD. 60 watts
50Elec. Princip.
P
I E
E=Voltage (Volts)
I=Current (Amps)
R=Resistance (Ohms)
P=Power (Watts)
E
I R
12 VDC
12 VDC0.2 amps 0.2 amps
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G5B05 - How many watts are dissipated when a current of 7.0 milliamperes flows through 1.25
kilohms resistance?A. Approximately 61 milliwattsB. Approximately 61 wattsC. Approximately 11 milliwattsD. Approximately 11 watts
51Elec. Princip.
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Electrical Principles 201052
G5B05 How many WATTS are dissipated when a current of 7.0 milliamperes flows
through 1.25 kilohms?
V
O A
WW??A V
VV=Voltage (Volts)=Voltage (Volts)
OO=Resistance =Resistance (Ohms)(Ohms)
AA=Current (Amps)=Current (Amps)
WW=Power (Watts)=Power (Watts)
1. What are you looking for? Watts
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Electrical Principles 201053
G5B05 How many watts are dissipated when a current of 7.0 milliamperes
flows through 1.25 kilohms?
V?V?1250 1250 ΩΩ 0.007
A
W ?
0.007 A
V
1.25 kilo ohms1.25 kilo ohms = 1250 Ohms = 1250 Ohms
7 mili Amps 7 mili Amps = 0.007 Amps= 0.007 Amps
2. What do you know? Put it on the circles.
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Electrical Principles 201054
G5B05 How many watts are dissipated when a current of 7.0 milliamperes flows
through 1.25 kilohms?
V ?
O
1,250 Ohms
A
0.007 Amps
STEP 3 - Find VSTEP 3 - Find V V = O x AV = O x A
V = 1,250Ω X 0.007 amps V = 8.750 V = 8.750
3. Find the voltage from the Ohns Law circle
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Radio and Electronic Fundamentals55
G5B05 How many watts are dissipated when a current of 7.0 milliamperes flows
through 1.25 kilohms?
W
0.007 A
8.750 V
STEP 4 - Find WW = A x V
W = 0.007 A x 8.75 V = 0.06125 W or 61.25 mW
4. Moves the Voltage to the Watts Circle
Solve the Watts Circles
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G5B05 - How many watts are dissipated when a current of 7.0 milliamperes flows through 1.25
kilohms resistance?A. Approximately 61 milliwattsA. Approximately 61 milliwattsB. Approximately 61 wattsC. Approximately 11 milliwattsD. Approximately 11 watts
56Elec. Princip.
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G5B06 - What is the output PEP from a transmitter if an oscilloscope measures 200 volts peak-to-peak across a 50 ohm
dummy load connected to the transmitter output?
A. 1.4 wattsB. 100 wattsC. 353.5 wattsD. 400 watts
57Elec. Princip.
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Electrical Principles 201058
G5B06 What is the output PEP from a transmitter if an oscilloscope measures 200 volts peak-to-peak across a 50-ohm dummy load connected to the transmitter output?
V rms
O A
WW??A VVV=Voltage (Volts)=Voltage (Volts)
OO=Resistance =Resistance (Ohms)(Ohms)
AA=Current (Amps)=Current (Amps)
WW=Power (Watts)=Power (Watts)
PEP is Peek Envelope Power
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Electrical Principles 201059
G5B06 What is the output PEP from a transmitter if an oscilloscope measures 200 volts peak-to-peak across a 50-ohm dummy load connected to the transmitter output?
V V rms ?rms ?O A
W?W?
A VVV=Voltage (Volts)=Voltage (Volts)
OO=Resistance =Resistance (Ohms)(Ohms)
AA=Current (Amps)=Current (Amps)
WW=Power (Watts)=Power (Watts)
You have Peak-to-Peak voltage
You need rms
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Electrical Principles 201060
G5B06 What is the output PEP from a transmitter if an oscilloscope measures 200
Volts peak-to-peak across a 50-ohm dummy load connected to the transmitter
output?
V rms ?50
OhmsA
WW??A V
VV=Voltage (Volts)=Voltage (Volts)
OO=Resistance =Resistance (Ohms)(Ohms)
AA=Current (Amps)=Current (Amps)
WW=Power (Watts)=Power (Watts)
200 V p to p200 V p to p
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Radio and Electronic Fundamentals61
G5B06 What is the output PEP from a transmitter if an oscilloscope measures 200 volts peak-to-peak across a 50-ohm
dummy load connected to the transmitter output?
V rmsO A
STEP 1 - Find RMS VoltsSTEP 1 - Find RMS Volts
200 V pp / 2 = 100 V peak
100 V peak X 0.707
= 70.7 V rms
1. Change P-to-P to rms volatage
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Radio and Electronic Fundamentals62
G5B06 What is the output PEP from a transmitter if an oscilloscope measures 200 volts peak-to-peak across a 50-ohm
dummy load connected to the transmitter output?
70.7 V rms
50 Ohms
A
STEP 2 - Find AmpsSTEP 2 - Find AmpsA = V / O
A = 70.7 V / 50 Ω = 1.414 A
2. Use rms voltage and solve for amps from Ohms Law Circle
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Radio and Electronic Fundamentals63
G5B06 What is the output PEP from a transmitter if an oscilloscope measures 200 volts peak-to-
peak across a 50-ohm dummy load connected to the transmitter output?
W
1.414 A
70.7 V rms
STEP 3 find WSTEP 3 find W W = A x V
W = 1.414 A x 70.7 V rms
= 100 W
3. Move amps into Watts Circle and solve for Watts
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G5B06 - What is the output PEP from a transmitter if an oscilloscope measures 200 volts peak-to-peak across a 50 ohm
dummy load connected to the transmitter output?
A. 1.4 watts
B. 100 wattsB. 100 wattsC. 353.5 wattsD. 400 watts
64Elec. Princip.
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G5B07 - What value of an AC signal produces the same power
dissipation in a resistor as a DC voltage of the same value?
A. The peak-to-peak value B. The peak value C. The RMS value D. The reciprocal of the RMS value
65Elec. Princip.
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G5B07 - What value of an AC signal produces the same power
dissipation in a resistor as a DC voltage of the same value?
A. The peak-to-peak value B. The peak value
C. The RMS value C. The RMS value D. The reciprocal of the RMS value
66Elec. Princip.
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G5B08 - What is the peak-to-peak voltage of a sine wave that has an RMS
voltage of 120 volts?
A. 84.8 volts B. 169.7 volts C. 240.0 voltsD. 338.4 volts
67Elec. Princip.
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G5B08 - What is the peak-to-peak voltage of a sine wave that has an RMS
voltage of 120 volts?
A. 84.8 volts B. 169.7 volts C. 240.0 volts
D. 338.4 volts
68Elec. Princip.
STEP 1120 Vrms / 0.7 = 169.7 VpSTEP 2169.7 X 2 = 338.4 Vpp
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G5B09 - What is the RMS voltage of a sine wave with a value of 17 volts
peak?
A. 8.5 volts B. 12 volts C. 24 volts D. 34 volts
69Elec. Princip.
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G5B09 - What is the RMS voltage of a sine wave with a value of 17 volts
peak?
A. 8.5 volts
B. 12 volts B. 12 volts C. 24 volts D. 34 volts
70Elec. Princip.
17 Vp X 0.7 = 11.9 Vrms
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G5B10 - What percentage of power loss would result from a transmission
line loss of 1 dB?
A. 10.9 percentB. 12.2 percentC. 20.5 percentD. 25.9 percent
71Elec. Princip.
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G5B10 - What percentage of power loss would result from a transmission
line loss of 1 dB?
A. 10.9 percentB. 12.2 percent
C. 20.5 percentD. 25.9 percent
72Elec. Princip.
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G5B11 - What is the ratio of peak envelope power to average power for an
unmodulated carrier?
A. 0.707B. 1.00C. 1.414D. 2.00
73Elec. Princip.
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G5B11 - What is the ratio of peak envelope power to average power for an
unmodulated carrier?
A. 0.707
B. 1.00B. 1.00C. 1.414D. 2.00
74Elec. Princip.
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G5B12 - What would be the RMS voltage across a 50 ohm dummy load
dissipating 1200 watts?
A. 173 voltsB. 245 voltsC. 346 voltsD. 692 volts
75Elec. Princip.
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Electrical Principles 201076
G5B12 What would be the RMS voltage across a 50-ohm dummy load dissipating 1200
watts?
V?O A
?
W
A?
V?VV=Voltage (Volts)=Voltage (Volts)
OO=Resistance =Resistance (Ohms)(Ohms)
AA=Current (Amps)=Current (Amps)
WW=Power (Watts)=Power (Watts)
Law and Power Calculations - Unit Circles
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Electrical Principles 201077
G5B12 What would be the RMS voltage across a 50-ohm dummy load dissipating
1200 watts?`
V
O A
W
V?
Replace Replace AAWith With V/OV/O
Voice Of America – VOLTAGE CIRCLE W A V - WATTAGE CIRCLE
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Electrical Principles 201078
G5B12 What would be the RMS voltage across a 50-ohm dummy load dissipating
1200 watts?
O x W
V
50 Ω x 1200 W
V ?
W A V - WATTAGE CIRCLE
↑↑V
O x W
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Electrical Principles 201079
G5B12 What would be the RMS voltage across a 50-ohm dummy load dissipating
1200 watts?
50 Ω x 1200 W
V
50 Ω x 1200 W
V ²
W A V - WATTAGE CIRCLE
↑↑VV
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Electrical Principles80
G5B12 What would be the RMS voltage across a 50-ohm dummy load
dissipating 1200 watts?– A. 173 volts
• B. 245 volts– C. 346 volts– D. 692 volts V ² = 1200 Watts x 50 V ² = 1200 Watts x 50
Ohms Ohms V V ²² = 60,000 = 60,000
V = square root 60,000V = square root 60,000V = √ 60.000V = √ 60.000
V = 245 VoltsV = 245 Volts
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G5B12 - What would be the RMS voltage across a 50 ohm dummy load
dissipating 1200 watts?
A. 173 volts
B. 245 voltsB. 245 voltsC. 346 voltsD. 692 volts
81Elec. Princip.
V = square root (W x V = square root (W x ΩΩ))V = V = √ (1200 x 50) √ (1200 x 50)
V = V = √ 60.000 √ 60.000
V = 245 VoltsV = 245 Volts
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G5B13 - What is the output PEP of an unmodulated carrier if an average
reading wattmeter connected to the transmitter output indicates 1060 watts?
A. 530 wattsB. 1060 wattsC. 1500 wattsD. 2120 watts
82Elec. Princip.
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G5B13 - What is the output PEP of an unmodulated carrier if an average
reading wattmeter connected to the transmitter output indicates 1060 watts?
A. 530 watts
B. 1060 wattsB. 1060 wattsC. 1500 wattsD. 2120 watts
83Elec. Princip.
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G5B14 - What is the output PEP from a transmitter if an oscilloscope
measures 500 volts peak-to-peak across a 50 ohm resistive load
connected to the transmitter output?
A. 8.75 wattsB. 625 wattsC. 2500 wattsD. 5000 watts
84Elec. Princip.
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Electrical Principles 201085
G5B14 What is the output PEP from a transmitter if an oscilloscope measures 500 volts peak-to-peak across a 50-ohm
resistor connected to the transmitter output?
V rms
O A
WW??A VVV=Voltage (Volts)=Voltage (Volts)
OO=Resistance =Resistance (Ohms)(Ohms)
AA=Current (Amps)=Current (Amps)
WW=Power (Watts)=Power (Watts)
You are looking for Wattage
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Electrical Principles 201086
G5B14 What is the output PEP from a transmitter if an oscilloscope measures 500
volts peak-to-peak across a 50-ohm resistor connected to the transmitter output?
V V rms ?rms ?
O A
W?W?
A V rmsVV=Voltage (Volts)=Voltage (Volts)
OO=Resistance =Resistance (Ohms)(Ohms)
AA=Current (Amps)=Current (Amps)
WW=Power (Watts)=Power (Watts)
You need V rms
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Electrical Principles 87Electrical Principles87
RMS, Peak and Peak to Peak Voltages
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Radio and Electronic Fundamentals88
G5B14 What is the output PEP from a transmitter if an oscilloscope measures
500 volts peak-to-peak across a 50-ohm resistor connected to the transmitter
output?
V rmsO A
STEP 1 - Find RMS VoltsSTEP 1 - Find RMS Volts
500 V pp / 2 = 250 V peak
250 V peak X 0.707
= 176.75 V rms
1. Change P-to-P to rms volatage
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Radio and Electronic Fundamentals89
G5B14 What is the output PEP from a transmitter if an oscilloscope measures 500 volts peak-to-peak across a 50-ohm resistor
connected to the transmitter output?
176.75 V rms
50 Ohms
A
STEP 2 - Find AmpsSTEP 2 - Find Amps A = V / O
A = 176.75 V rms / 50 Ω
= 3.535 A
2. Put V rms in to Ohm Circle and find Amps
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Radio and Electronic Fundamentals90
G5B14 What is the output PEP from a transmitter if an oscilloscope measures 500 volts peak-to-peak across a 50-ohm resistor
connected to the transmitter output?
W
3.535 A
176.75 V rms
STEP 3 find WSTEP 3 find W W = A x VW = A x V
W = 3.535 A x 176.75 V rmsW = 3.535 A x 176.75 V rms
= 624.811 W
3. Put amps into Watts Circle and solve for Watts
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G5B14 - What is the output PEP from a transmitter if an oscilloscope
measures 500 volts peak-to-peak across a 50 ohm resistive load
connected to the transmitter output?
A. 8.75 watts
B. 625 wattsB. 625 wattsC. 2500 wattsD. 5000 watts
91Elec. Princip.
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G5C – Resistors, capacitors, and inductors in series and parallel;
transformers
92Elec. Princip.
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G5C01 - What causes a voltage to appear across the secondary
winding of a transformer when an AC voltage source is connected
across its primary winding?A. Capacitive couplingB. Displacement current couplingC. Mutual inductanceD. Mutual capacitance
93Elec. Princip.
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G5C01 - What causes a voltage to appear across the secondary
winding of a transformer when an AC voltage source is connected
across its primary winding?A. Capacitive couplingB. Displacement current coupling
C. Mutual inductanceC. Mutual inductanceD. Mutual capacitance
94Elec. Princip.
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G5C02 - What happens if you reverse the primary and secondary windings of a 4:1 voltage step down
transformer?A. The secondary voltage becomes 4 times the primary voltageB. The transformer no longer functions as it is a unidirectional deviceC. Additional resistance must be added in series with the primary to prevent overloadD. Additional resistance must be added in parallel with the secondary to prevent overload
95Elec. Princip.
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G5C02 - What happens if you reverse the primary and secondary windings of a 4:1 voltage step down
transformer?
A. The secondary voltage becomes 4 A. The secondary voltage becomes 4 times the primary voltagetimes the primary voltageB. The transformer no longer functions as it is a unidirectional deviceC. Additional resistance must be added in series with the primary to prevent overloadD. Additional resistance must be added in parallel with the secondary to prevent overload
96Elec. Princip.
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G5C03 - Which of the following components should be added to an
existing resistor to increase the resistance?
A. A resistor in parallelB. A resistor in seriesC. A capacitor in seriesD. A capacitor in parallel
97Elec. Princip.
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G5C03 - Which of the following components should be added to an
existing resistor to increase the resistance?
A. A resistor in parallel
B. A resistor in seriesC. A capacitor in seriesD. A capacitor in parallel
98Elec. Princip.
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G5C04 - What is the total resistance of three 100 ohm
resistors in parallel?
A. 0.30 ohmsB. 0.33 ohmsC. 33.3 ohmsD. 300 ohms
99Elec. Princip.
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G5C04 - What is the total resistance of three 100 ohm
resistors in parallel?
A. 0.30 ohmsB. 0.33 ohms
C. 33.3 ohmsC. 33.3 ohmsD. 300 ohms
100Elec. Princip.
100 / 3 = 33.3 Ω
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G5C05 - If three equal value resistors in series produce 450 ohms, what is the value of each
resistor?
A. 1500 ohmsB. 90 ohmsC. 150 ohmsD. 175 ohms
101Elec. Princip.
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G5C05 - If three equal value resistors in series produce 450 ohms, what is the value of each
resistor?
A. 1500 ohmsB. 90 ohms
C. 150 ohmsC. 150 ohmsD. 175 ohms
102Elec. Princip.
450 / 3 = 150 Ω
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G5C06 - What is the RMS voltage across a 500-turn secondary winding in
a transformer if the 2250-turn primary is connected to 120 VAC?
A. 2370 voltsB. 540 voltsC. 26.7 voltsD. 5.9 volts
103Elec. Princip.
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G5C06 - What is the RMS voltage across a 500-turn secondary winding in
a transformer if the 2250-turn primary is connected to 120 VAC?
A. 2370 voltsB. 540 volts
C. 26.7 voltsC. 26.7 voltsD. 5.9 volts
104Elec. Princip.
Voltage ratio = Turn Ratio
500 / 2250 x 120 V =26.66 Vac
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G5C07 - What is the turns ratio of a transformer used to match an audio
amplifier having 600 ohm output impedance to a speaker having 4
ohm impedance?
A. 12.2 to 1B. 24.4 to 1C. 150 to 1D. 300 to 1
105Elec. Princip.
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G5C07 - What is the turns ratio of a transformer used to match an audio
amplifier having 600 ohm output impedance to a speaker having 4
ohm impedance?
A. 12.2 to 1A. 12.2 to 1B. 24.4 to 1C. 150 to 1D. 300 to 1
106Elec. Princip.
Turn ratio = ( 600 / 4)150 = 12.2 to 1
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G5C08 - What is the equivalent capacitance of two 5.0 nanofarad capacitors and one 750 picofarad capacitor connected in parallel?
A. 576.9 nanofaradsB. 1733 picofaradsC. 3583 picofaradsD. 10.750 nanofarads
107Elec. Princip.
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G5C08 - What is the equivalent capacitance of two 5.0 nanofarad capacitors and one 750 picofarad capacitor connected in parallel?
A. 576.9 nanofaradsB. 1733 picofaradsC. 3583 picofarads
D. 10.750 nanofaradsD. 10.750 nanofarads
108Elec. Princip.
Add capacitance in Parallel5 nf = 5,000 pf
5,000 pf 750 pf10,750 pf
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G5C09 - What is the capacitance of three 100 microfarad capacitors
connected in series?
A. 0.30 microfaradsB. 0.33 microfaradsC. 33.3 microfaradsD. 300 microfarads
109Elec. Princip.
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G5C09 - What is the capacitance of three 100 microfarad capacitors
connected in series?
A. 0.30 microfaradsB. 0.33 microfarads
C. 33.3 microfaradsC. 33.3 microfaradsD. 300 microfarads
110Elec. Princip.
Divide Capacitance in series100 / 3 = 33.3 mf
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G5C10 - What is the inductance of three 10 millihenry inductors
connected in parallel?
A. 0.30 henrysB. 3.3 henrysC. 3.3 millihenrysD. 30 millihenrys
111Elec. Princip.
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G5C10 - What is the inductance of three 10 millihenry inductors
connected in parallel?
A. 0.30 henrysB. 3.3 henrys
C. 3.3 millihenrysC. 3.3 millihenrysD. 30 millihenrys
112Elec. Princip.
Divide Inductance in parallel10 / 3 = 3.33 mh
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G5C11 - What is the inductance of a 20 millihenry inductor connected
in series with a 50 millihenry inductor?
A. 0.07 millihenrysB. 14.3 millihenrysC. 70 millihenrysD. 1000 millihenrys
113Elec. Princip.
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G5C11 - What is the inductance of a 20 millihenry inductor connected
in series with a 50 millihenry inductor?
A. 0.07 millihenrysB. 14.3 millihenrys
C. 70 millihenrysC. 70 millihenrysD. 1000 millihenrys
114Elec. Princip.
Add Inductprs in series20 + 50 = 70 mh
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G5C12 - What is the capacitance of a 20 microfarad capacitor connected
in series with a 50 microfarad capacitor?
A. 0.07 microfaradsB. 14.3 microfaradsC. 70 microfaradsD. 1000 microfarads
115Elec. Princip.
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G5C12 - What is the capacitance of a 20 microfarad capacitor connected
in series with a 50 microfarad capacitor?
A. 0.07 microfarads
B. 14.3 microfaradsB. 14.3 microfaradsC. 70 microfaradsD. 1000 microfarads
116Elec. Princip.
cC1 x C2 C1 + C2
20 x 50 1,00020 + 50 70
= 14.286 mf
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G5C13 - Which of the following components should be added to a
capacitor to increase the capacitance?
A. An inductor in series B. A resistor in seriesC. A capacitor in parallelD. A capacitor in series
117Elec. Princip.
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G5C13 - Which of the following components should be added to a
capacitor to increase the capacitance?
A. An inductor in series B. A resistor in series
C. A capacitor in parallelC. A capacitor in parallelD. A capacitor in series
118Elec. Princip.
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G5C14 - Which of the following components should be added to an
inductor to increase the inductance?
A. A capacitor in seriesB. A resistor in parallelC. An inductor in parallelD. An inductor in series
119Elec. Princip.
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G5C14 - Which of the following components should be added to an
inductor to increase the inductance?
A. A capacitor in seriesB. A resistor in parallelC. An inductor in parallel
D. An inductor in seriesD. An inductor in series
120Elec. Princip.
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G5C15 - What is the total resistance of a 10 ohm, a 20 ohm, and a 50 ohm resistor connected in
parallel?
A. 5.9 ohmsB. 0.17 ohmsC. 10000 ohmsD. 80 ohms
121Elec. Princip.
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Electrical Principles122
G5C15 - What is the total resistance of a 10 ohm, a 20 ohm, and a 50 ohm
resistor in parallel?• A. 5.9 ohms
– B. 0.17 ohms– C. 10000 ohms– D. 80 ohms
R = R = 1 . 1 .(1/R1 + 1/R2 + 1/R3)(1/R1 + 1/R2 + 1/R3)
R = R = 1 . 1 . (1/10 + 1/20 + 1/50)(1/10 + 1/20 + 1/50)
R total = 100 / 17 = 5.9 R total = 100 / 17 = 5.9 ohmsohms
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G5C16 - Why is the conductor of the primary winding of many voltage
step up transformers larger in diameter than the conductor of the
secondary winding?A. To improve the coupling between the primary and secondaryB. To accommodate the higher current of the primaryC. To prevent parasitic oscillations due to resistive losses in the primaryD. To insure that the volume of the primary winding is equal to the volume of the secondary winding
123Elec. Princip.
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G5C16 - Why is the conductor of the primary winding of many voltage
step up transformers larger in diameter than the conductor of the
secondary winding?A. To improve the coupling between the primary and secondary
B. To accommodate the higher current B. To accommodate the higher current of the primaryof the primaryC. To prevent parasitic oscillations due to resistive losses in the primaryD. To insure that the volume of the primary winding is equal to the volume of the secondary winding
124Elec. Princip.
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G5C17 - What is the value in nanofarads (nF) of a 22,000 pF
capacitor?
A. 0.22 nF B. 2.2 nF C. 22 nF D. 220 nF
125Elec. Princip.
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G5C17 - What is the value in nanofarads (nF) of a 22,000 pF
capacitor?
A. 0.22 nF B. 2.2 nF C. 22 nF C. 22 nF D. 220 nF
126Elec. Princip.
1 pf = 0.000 000 000 001 f1 nf = 0.000 000 001 f1 mf = 0.000.001 f
22,000 pf = 22 nf
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G5C18 - What is the value in microfarads of a 4700 nanofarad
( nF ) capacitor?
A. 47 µFB. 0.47 µFC. 47,000 µF D. 4.7 µF
127Elec. Princip.
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G5C18 - What is the value in microfarads of a 4700 nanofarad
( nF ) capacitor?
A. 47 µFB. 0.47 µFC. 47,000 µF D. 4.7 µFD. 4.7 µF
128Elec. Princip.
4,700 nf = 4.700 mf
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End OfSUBELEMENT G5
ELECTRICAL PRINCIPLES