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Roanoke Valley Amateur Radio Club

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Presentation on theme: "Roanoke Valley Amateur Radio Club"— Presentation transcript:

1 Roanoke Valley Amateur Radio Club
Welcome Roanoke Valley Amateur Radio Club

2 Amateur Radio License Exam Preparation Course
Technician Sponsored by the Roanoke Valley Amateur Radio Club

3 Class Outline T1 - 6 questions - FCC Rules, descriptions, and definitions for the Amateur Radio Service, operator and station license responsibilities. T2 - 3 questions - Operating Procedures. T3 - 3 questions - Radio wave characteristics: properties of radio waves; propagation modes. T4 - 2 exam questions - Amateur radio practices and station set up. T5 - 4 exam questions - Electrical principles: math for electronics; electronic principles; Ohm’s Law. T6 - 4 exam questions - Electrical components; circuit diagrams; component functions. T7 - 4 exam questions - Station equipment: common transmitter and receiver problems; antenna measurements; troubleshooting; basic repair and testing. T8 - 4 exam questions - Modulation modes: amateur satellite operation; operating activities; non-voice and digital communications. T9 - 2 exam questions - Antennas and feed lines. T0 - 3 exam questions - Electrical safety: AC and DC power circuits; antenna installation; RF hazards.

4 Subelement T5 T5 - 4 questions - Electrical principles: math for electronics; electronic principles; Ohm’s Law.

5 Subelement T5 Electrical current is measured in Amperes. (T5A01)
Current is the name for the flow of electrons in an electric circuit. (T5A03) Electrical power is measured in Watts. (T5A02) Power describes the rate at which electrical energy is used. (T5A10)

6 Subelement T5 The volt is the basic unit of electromotive force. (T5A11) Voltage is the electrical term for the electromotive force (EMF) that causes electron flow. (T5A05)

7 Subelement T5 Direct current is the name for a current that flows only in one direction. (T5A04) Alternating current is the name for a current that reverses direction on a regular basis. (T5A09)

8 Subelement T5 Frequency describes the number of times per second that an alternating current reverses direction. (T5A12) Hertz is the unit of frequency. (T5C05)

9 Subelement T5 A mobile transceiver usually requires about 12 volts. (T5A06) Copper is a good electrical conductor. (T5A07) Glass is a good electrical insulator. (T5A08)

10 Scientific Notation 1,000,000,000 (9 zeros) = 1 X 109 GIGA
1,000,000 (6 zeros) = 1 X 106 MEGA 1,000 = 1 X KILO 1 = 1 X UNIT = 1 X CENTI = 1 X MILLI = 1 X MICRO = 1 X NANO = 1 X PICO

11 Subelement T5 3525 kHz is 3.525 MHz (T5B07)
MHz is equal to 28,400 kHz (T5B12) 2.425 GHz is 2425 MHz (T5B13) 1,500 milliamperes is 1.5 amperes (T5B01) 1500 kHz is another way to specify a radio signal frequency of 1,500,000 hertz (T5B02)

12 Subelement T5 One thousand volts is equal to one kilovolt (T5B03)
One one-millionth of a volt is equal to one microvolt (T5B04) 0.5 watts is equivalent to 500 milliwatts (T5B05) 3 amperes is 3000-milliampere of current (T5B06) 1 microfarad is 1,000,000 picofarads (T5B08)

13 Power Multipliers 1 S-Unit = 20dB 20dB = 100x Power Change

14 Subelement T5 It takes 3 dB of a power increase from 5 watts to 10 watts (T5B09) It takes -6 dB of a power decrease from 12 watts to 3 watts (T5B10) It takes 10 dB of a power increase from 20 watts to 200 watts (T5B11)

15 Subelement T5 Capacitance is the ability to store energy in an electric field. (T5C01) The farad is the basic unit of capacitance. (T5C02) Inductance is the ability to store energy in a magnetic field. (T5C03) The henry is the basic unit of inductance. (T5C04)

16 Subelement T5 Impedance is a measure of the opposition to AC current flow in a circuit. (T5C12) Ohms are the unit of impedance. (T5C13)

17 Subelement T5 The abbreviation “RF” refers to Radio frequency signals of all types. (T5C06) Radio waves are the name for electromagnetic waves that travel through space. (T507)

18 Subelement T5 Power (P) equals voltage (E) multiplied by current (I) is the formula used to calculate electrical power in a DC circuit (T5C08) E P P I R I E I2 R

19 Subelement T5 P is for power (watts) E is for Voltage
I is for current (amperes) The math is easy Two known numbers are given, solve for the unknown Cover up the unknown and plug the numbers in the other two

20 Subelement T5 138 watts is being used in a circuit when the applied voltage is 13.8 volts DC and the current is 10 amperes (13.8 volts x 10 amp = 138 watts) (T5C09) 30 watts is being used in a circuit when the applied voltage is 12 volts DC and the current is 2.5 amperes (12 volts x 2.5 amp = 30 watts) (T5C10) 10 amperes is flowing in a circuit when the applied voltage is 12 volts DC and the load is 120 watts (120 amp / 12 volts = 10 amp) (T5C11)

21 Subelement T5 Current (I) equals voltage (E) divided by resistance (R) is used to calculate current in a circuit (T5D01) Voltage (E) equals current (I) multiplied by resistance (R) is used to calculate voltage in a circuit (T5D02) Resistance (R) equals voltage (E) divided by current (I) is used to calculate resistance in a circuit (T5D03)

22 Subelement T5 R is for resistance The math is easy
Two known numbers are given, solve for the unknown Cover up the unknown and plug the numbers in the other two

23 Subelement T5 E P P I R I E I2 R 30 ohms is the resistance of a circuit in which a current of 3 amperes flows through a resistor connected to 90 volts (90 volts / 3 amp = 30 ohms) (T5D04) 8 ohms is the resistance in a circuit for which the applied voltage is 12 volts and the current flow is 1.5 amperes (12 volts / 1.5 amp = 8 ohms) (T5D05)

24 Subelement T5 3 ohms is the resistance of a circuit that draws 4 amperes from a 12-volt source (12 volts / 4 amp = 3 ohms) (T5D06) 1.5 amperes is the current flow in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms (120 volts / 80 ohms = 1.5 amp) (T5D07) 2 amperes is the current flowing through a 100- ohm resistor connected across 200 volts (200 volts / 100 ohms = 2 amp) (T5D08)

25 Subelement T5 10 amperes is the current flowing through a 24-ohm resistor connected across 240 volts (240 volts / 24 ohms = 10 amp) (T5D09) 1 volt is the voltage across a 2-ohm resistor if a current of 0.5 amperes (.5 amp x 2 ohms = 1 volts) (T5D10)

26 Subelement T5 10 volts is the voltage across a 10-ohm resistor if a current of 1 ampere (1 amp x 10 ohms = 10 volts) (T5D11) 20 volts is the voltage across a 10-ohm resistor if a current of 2 amperes (2 amp x 10 ohms = 20 volts) (T5D12)

27

28 Electrical current is measured in which of the following units? (T5A01)
A. Volts B. Watts C. Ohms D. Amperes

29 Electrical current is measured in which of the following units? (T5A01)
A. Volts B. Watts C. Ohms D. Amperes

30 Electrical power is measured in which of the following units? (T5A02)
A. Volts B. Watts C. Ohms D. Amperes

31 Electrical power is measured in which of the following units? (T5A02)
A. Volts B. Watts C. Ohms D. Amperes

32 What is the name for the flow of electrons in an electric circuit
What is the name for the flow of electrons in an electric circuit? (T5A03) A. Voltage B. Resistance C. Capacitance D. Current

33 What is the name for the flow of electrons in an electric circuit
What is the name for the flow of electrons in an electric circuit? (T5A03) A. Voltage B. Resistance C. Capacitance D. Current

34 What is the name for a current that flows only in one direction
What is the name for a current that flows only in one direction? (T5A04) A. Alternating current B. Direct current C. Normal current D. Smooth current

35 What is the name for a current that flows only in one direction
What is the name for a current that flows only in one direction? (T5A04) A. Alternating current B. Direct current C. Normal current D. Smooth current

36 What is the electrical term for the electromotive force (EMF) that causes electron flow? (T5A05)
A. Voltage B. Ampere-hours C. Capacitance D. Inductance

37 What is the electrical term for the electromotive force (EMF) that causes electron flow? (T5A05)
A. Voltage B. Ampere-hours C. Capacitance D. Inductance

38 How much voltage does a mobile transceiver usually require? (T5A06)
A. About 12 volts B. About 30 volts C. About 120 volts D. About 240 volts

39 How much voltage does a mobile transceiver usually require? (T5A06)
A. About 12 volts B. About 30 volts C. About 120 volts D. About 240 volts

40 Which of the following is a good electrical conductor? (T5A07)
A. Glass B. Wood C. Copper D. Rubber

41 Which of the following is a good electrical conductor? (T5A07)
A. Glass B. Wood C. Copper D. Rubber

42 Which of the following is a good electrical insulator? (T5A08)
A. Copper B. Glass C. Aluminum D. Mercury

43 Which of the following is a good electrical insulator? (T5A08)
A. Copper B. Glass C. Aluminum D. Mercury

44 What is the name of a current that reverses direction on a regular basis? (T5A09)
A. Alternating current B. Direct current C. Circular current D. Vertical current

45 What is the name of a current that reverses direction on a regular basis? (T5A09)
A. Alternating current B. Direct current C. Circular current D. Vertical current

46 Which term describes the rate at which electrical energy is used
Which term describes the rate at which electrical energy is used? (T5A10) A. Resistance B. Current C. Power D. Voltage

47 Which term describes the rate at which electrical energy is used
Which term describes the rate at which electrical energy is used? (T5A10) A. Resistance B. Current C. Power D. Voltage

48 What is the basic unit of electromotive force? (T5A11)
A. The volt B. The watt C. The ampere D. The ohm

49 What is the basic unit of electromotive force? (T5A11)
A. The volt B. The watt C. The ampere D. The ohm

50 What term describes the number of times per second that an alternating current reverses direction? (T5A12) A. Pulse rate B. Speed C. Wavelength D. Frequency

51 What term describes the number of times per second that an alternating current reverses direction? (T5A12) A. Pulse rate B. Speed C. Wavelength D. Frequency

52 How many milliamperes is 1.5 amperes? (T5B01)
A. 15 milliamperes B. 150 milliamperes C. 1,500 milliamperes D. 15,000 milliamperes

53 How many milliamperes is 1.5 amperes? (T5B01)
A. 15 milliamperes B. 150 milliamperes C. 1,500 milliamperes D. 15,000 milliamperes

54 What is another way to specify a radio signal frequency of 1,500,000 hertz? (T5B02)
A kHz B MHz C. 15 GHz D. 150 kHz

55 What is another way to specify a radio signal frequency of 1,500,000 hertz? (T5B02)
A kHz B MHz C. 15 GHz D. 150 kHz

56 How many volts are equal to one kilovolt? (T5B03)
A. One one-thousandth of a volt B. One hundred volts C. One thousand volts D. One million volts

57 How many volts are equal to one kilovolt? (T5B03)
A. One one-thousandth of a volt B. One hundred volts C. One thousand volts D. One million volts

58 How many volts are equal to one microvolt? (T5B04)
A. One one-millionth of a volt B. One million volts C. One thousand kilovolts D. One one-thousandth of a volt

59 How many volts are equal to one microvolt? (T5B04)
A. One one-millionth of a volt B. One million volts C. One thousand kilovolts D. One one-thousandth of a volt

60 Which of the following is equivalent to 500 milliwatts? (T5B05)
A watts B. 0.5 watts C. 5 watts D. 50 watts

61 Which of the following is equivalent to 500 milliwatts? (T5B05)
A watts B. 0.5 watts C. 5 watts D. 50 watts

62 If an ammeter calibrated in amperes is used to measure a 3000-milliampere current, what reading would it show? (T5B06) A amperes B. 0.3 amperes C. 3 amperes D. 3,000,000 amperes

63 If an ammeter calibrated in amperes is used to measure a 3000-milliampere current, what reading would it show? (T5B06) A amperes B. 0.3 amperes C. 3 amperes D. 3,000,000 amperes

64 If a frequency readout calibrated in megahertz shows a reading of 3
If a frequency readout calibrated in megahertz shows a reading of MHz, what would it show if it were calibrated in kilohertz? (T5B07) A kHz B kHz C kHz D. 3,525,000 kHz

65 If a frequency readout calibrated in megahertz shows a reading of 3
If a frequency readout calibrated in megahertz shows a reading of MHz, what would it show if it were calibrated in kilohertz? (T5B07) A kHz B kHz C kHz D. 3,525,000 kHz

66 How many microfarads are 1,000,000 picofarads? (T5B08)
A microfarads B. 1 microfarad C microfarads D. 1,000,000,000 microfarads

67 How many microfarads are 1,000,000 picofarads? (T5B08)
A microfarads B. 1 microfarad C microfarads D. 1,000,000,000 microfarads

68 What is the approximate amount of change, measured in decibels (dB), of a power increase from 5 watts to 10 watts? (T5B09) A. 2 dB B. 3 dB C. 5 dB D. 10 dB

69 What is the approximate amount of change, measured in decibels (dB), of a power increase from 5 watts to 10 watts? (T5B09) A. 2 dB B. 3 dB C. 5 dB D. 10 dB

70 What is the approximate amount of change, measured in decibels (dB), of a power decrease from 12 watts to 3 watts? (T5B10) A. -1 dB B. -3 dB C. -6 dB D. -9 dB

71 What is the approximate amount of change, measured in decibels (dB), of a power decrease from 12 watts to 3 watts? (T5B10) A. -1 dB B. -3 dB C. -6 dB D. -9 dB

72 What is the approximate amount of change, measured in decibels (dB), of a power increase from 20 watts to 200 watts? (T5B11) A. 10 dB B. 12 dB C. 18 dB D. 28 dB

73 What is the approximate amount of change, measured in decibels (dB), of a power increase from 20 watts to 200 watts? (T5B11) A. 10 dB B. 12 dB C. 18 dB D. 28 dB

74 Which of the following frequencies is equal to 28,400 kHz? (T5B12)
A MHz B MHz C MHz D kHz

75 Which of the following frequencies is equal to 28,400 kHz? (T5B12)
A MHz B MHz C MHz D kHz

76 If a frequency readout shows a reading of 2425 MHz, what frequency is that in GHz? (T5B13)
A GHZ B GHz C GHz D GHz

77 If a frequency readout shows a reading of 2425 MHz, what frequency is that in GHz? (T5B13)
A GHZ B GHz C GHz D GHz

78 What is the ability to store energy in an electric field called
What is the ability to store energy in an electric field called? (T5C01) A. Inductance B. Resistance C. Tolerance D. Capacitance

79 What is the ability to store energy in an electric field called
What is the ability to store energy in an electric field called? (T5C01) A. Inductance B. Resistance C. Tolerance D. Capacitance

80 What is the basic unit of capacitance? (T5C02)
A. The farad B. The ohm C. The volt D. The henry

81 What is the basic unit of capacitance? (T5C02)
A. The farad B. The ohm C. The volt D. The henry

82 What is the ability to store energy in a magnetic field called? (T5C03)
A. Admittance B. Capacitance C. Resistance D. Inductance

83 What is the ability to store energy in a magnetic field called? (T5C03)
A. Admittance B. Capacitance C. Resistance D. Inductance

84 What is the basic unit of inductance? (T5C04)
A. The coulomb B. The farad C. The henry D. The ohm

85 What is the basic unit of inductance? (T5C04)
A. The coulomb B. The farad C. The henry D. The ohm

86 What is the unit of frequency? (T5C05)
A. Hertz B. Henry C. Farad D. Tesla

87 What is the unit of frequency? (T5C05)
A. Hertz B. Henry C. Farad D. Tesla

88 What does the abbreviation "RF" refer to? (T5C06)
A. Radio frequency signals of all types B. The resonant frequency of a tuned circuit C. The real frequency transmitted as opposed to the apparent frequency D. Reflective force in antenna transmission lines

89 What does the abbreviation "RF" refer to? (T5C06)
A. Radio frequency signals of all types B. The resonant frequency of a tuned circuit C. The real frequency transmitted as opposed to the apparent frequency D. Reflective force in antenna transmission lines

90 What is a usual name for electromagnetic waves that travel through space? (T5C07)
A. Gravity waves B. Sound waves C. Radio waves D. Pressure waves

91 What is a usual name for electromagnetic waves that travel through space? (T5C07)
A. Gravity waves B. Sound waves C. Radio waves D. Pressure waves

92 What is the formula used to calculate electrical power in a DC circuit
What is the formula used to calculate electrical power in a DC circuit? (T5C08) A. Power (P) equals voltage (E) multiplied by current (I) B. Power (P) equals voltage (E) divided by current (I) C. Power (P) equals voltage (E) minus current (I) D. Power (P) equals voltage (E) plus current (I)

93 What is the formula used to calculate electrical power in a DC circuit
What is the formula used to calculate electrical power in a DC circuit? (T5C08) A. Power (P) equals voltage (E) multiplied by current (I) B. Power (P) equals voltage (E) divided by current (I) C. Power (P) equals voltage (E) minus current (I) D. Power (P) equals voltage (E) plus current (I)

94 How much power is being used in a circuit when the applied voltage is 13.8 volts DC and the current is 10 amperes? (T5C09) A. 138 watts B. 0.7 watts C watts D. 3.8 watts

95 How much power is being used in a circuit when the applied voltage is 13.8 volts DC and the current is 10 amperes? (T5C09) A. 138 watts B. 0.7 watts C watts D. 3.8 watts

96 How much power is being used in a circuit when the applied voltage is 12 volts DC and the current is 2.5 amperes? (T5C10) A. 4.8 watts B. 30 watts C watts D watts

97 How much power is being used in a circuit when the applied voltage is 12 volts DC and the current is 2.5 amperes? (T5C10) A. 4.8 watts B. 30 watts C watts D watts

98 How many amperes are flowing in a circuit when the applied voltage is 12 volts DC and the load is 120 watts? (T5C11) A. 0.1 amperes B. 10 amperes C. 12 amperes D. 132 amperes

99 How many amperes are flowing in a circuit when the applied voltage is 12 volts DC and the load is 120 watts? (T5C11) A. 0.1 amperes B. 10 amperes C. 12 amperes D. 132 amperes

100 What is meant by the term impedance? (T5C12)
A. It is a measure of the opposition to AC current flow in a circuit B. It is the inverse of resistance C. It is a measure of the Q or Quality Factor of a component D. It is a measure of the power handling capability of a component

101 What is meant by the term impedance? (T5C12)
A. It is a measure of the opposition to AC current flow in a circuit B. It is the inverse of resistance C. It is a measure of the Q or Quality Factor of a component D. It is a measure of the power handling capability of a component

102 What is a unit of impedance? (T5C13)
A. Volts B. Amperes C. Coulombs D. Ohms

103 What is a unit of impedance? (T5C13)
A. Volts B. Amperes C. Coulombs D. Ohms

104 What formula is used to calculate current in a circuit? (T5D01)
A. Current (I) equals voltage (E) multiplied by resistance (R) B. Current (I) equals voltage (E) divided by resistance (R) C. Current (I) equals voltage (E) added to resistance (R) D. Current (I) equals voltage (E) minus resistance (R)

105 What formula is used to calculate current in a circuit? (T5D01)
A. Current (I) equals voltage (E) multiplied by resistance (R) B. Current (I) equals voltage (E) divided by resistance (R) C. Current (I) equals voltage (E) added to resistance (R) D. Current (I) equals voltage (E) minus resistance (R)

106 What formula is used to calculate voltage in a circuit? (T5D02)
A. Voltage (E) equals current (I) multiplied by resistance (R) B. Voltage (E) equals current (I) divided by resistance (R) C. Voltage (E) equals current (I) added to resistance (R) D. Voltage (E) equals current (I) minus resistance (R)

107 What formula is used to calculate voltage in a circuit? (T5D02)
A. Voltage (E) equals current (I) multiplied by resistance (R) B. Voltage (E) equals current (I) divided by resistance (R) C. Voltage (E) equals current (I) added to resistance (R) D. Voltage (E) equals current (I) minus resistance (R)

108 What formula is used to calculate resistance in a circuit? (T5D03)
A. Resistance (R) equals voltage (E) multiplied by current (I) B. Resistance (R) equals voltage (E) divided by current (I) C. Resistance (R) equals voltage (E) added to current (I) D. Resistance (R) equals voltage (E) minus current (I)

109 What formula is used to calculate resistance in a circuit? (T5D03)
A. Resistance (R) equals voltage (E) multiplied by current (I) B. Resistance (R) equals voltage (E) divided by current (I) C. Resistance (R) equals voltage (E) added to current (I) D. Resistance (R) equals voltage (E) minus current (I)

110 What is the resistance of a circuit in which a current of 3 amperes flows through a resistor connected to 90 volts? (T5D04) A. 3 ohms B. 30 ohms C. 93 ohms D. 270 ohms

111 What is the resistance of a circuit in which a current of 3 amperes flows through a resistor connected to 90 volts? (T5D04) A. 3 ohms B. 30 ohms C. 93 ohms D. 270 ohms

112 What is the resistance in a circuit for which the applied voltage is 12 volts and the current flow is 1.5 amperes? (T5D05) A. 18 ohms B ohms C. 8 ohms D ohms

113 What is the resistance in a circuit for which the applied voltage is 12 volts and the current flow is 1.5 amperes? (T5D05) A. 18 ohms B ohms C. 8 ohms D ohms

114 What is the resistance of a circuit that draws 4 amperes from a 12-volt source? (T5D06)
A. 3 ohms B. 16 ohms C. 48 ohms D. 8 ohms

115 What is the resistance of a circuit that draws 4 amperes from a 12-volt source? (T5D06)
A. 3 ohms B. 16 ohms C. 48 ohms D. 8 ohms

116 What is the current flow in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms? (T5D07) A amperes B. 200 amperes C amperes D. 1.5 amperes

117 What is the current flow in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms? (T5D07) A amperes B. 200 amperes C amperes D. 1.5 amperes

118 What is the current flowing through a 100-ohm resistor connected across 200 volts? (T5D08)
A. 20,000 amperes B. 0.5 amperes C. 2 amperes D. 100 amperes

119 What is the current flowing through a 100-ohm resistor connected across 200 volts? (T5D08)
A. 20,000 amperes B. 0.5 amperes C. 2 amperes D. 100 amperes

120 What is the current flowing through a 24-ohm resistor connected across 240 volts? (T5D09)
A. 24,000 amperes B. 0.1 amperes C. 10 amperes D. 216 amperes

121 What is the current flowing through a 24-ohm resistor connected across 240 volts? (T5D09)
A. 24,000 amperes B. 0.1 amperes C. 10 amperes D. 216 amperes

122 What is the voltage across a 2-ohm resistor if a current of 0
What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it? (T5D10) A. 1 volt B volts C. 2.5 volts D. 1.5 volts

123 What is the voltage across a 2-ohm resistor if a current of 0
What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it? (T5D10) A. 1 volt B volts C. 2.5 volts D. 1.5 volts

124 What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it? (T5D11)
A. 1 volt B. 10 volts C. 11 volts D. 9 volts

125 What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it? (T5D11)
A. 1 volt B. 10 volts C. 11 volts D. 9 volts

126 What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it? (T5D12)
A. 8 volts B. 0.2 volts C. 12 volts D. 20 volts

127 What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it? (T5D12)
A. 8 volts B. 0.2 volts C. 12 volts D. 20 volts

128 Let's see what you've learned. Practice test time!

129 Practice Test Resources
ARRL Review by subelement QRZ Gives correct answers as you go eHam Like taking the real test AA9PW Gives the most info—shows where you need to study


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