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Technician Licensing Class

This technician licensing class covers electrical principles, math for electronics, and electronic principles. Topics include Ohm's Law, electrical currents and voltages, power calculations, capacitance, inductance, and impedance.

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Technician Licensing Class

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  1. Technician Licensing Class Electrical principles, math for electronics, electronic principles,Ohm’s Law T5A - T5D Valid July 1, 2014 Through June 30, 2018 Developed by Bob Bytheway, K3DIO, and slightly modified by SPARC

  2. T 5 A Electrical current is measured in amperes. T5A01 The basic unit of electrical power is measured in Watts. T5A02 The name for the flow of electrons in an electric circuit is current. T5A03 2

  3. T 5 A The name for a current that flows only in one direction is called direct current. T5A04 • The electrical term for the electromotive force (EMF) that causes electron flow is voltage. T5A05 • A mobile transceiver usually requires 12 volts. T5A06 Motor cycle battery AAA battery 9 Volt battery Hand held battery 3

  4. T 5 A • A mobile transceiver usually requires 12 volts. T5A06 • Copper is a good electrical conductor. T5A07 • A good electrical insulator is glass. T5A08 • The name for a current that reverses direction on a regular basis is alternating current. T5A09

  5. T 5 A The term that describes the rate at which electrical energy is used is called Power. T5A10 The basic unit of electromotive force is voltage. T5A11 Frequency is the term to describe the number of times per second that an alternating current reverses direction. T5A12 5

  6. T 5 B 1.5 amperes is the same as: Another way to specify a radio signal frequency of 1,500,000 hertz is: There are one thousand volts in: One one-millionth of a volt is equal to: 1,500 milliamperes. T5B01 1500 kHzT5B02 One KilovoltT5B03 one microvolt T5B04 6

  7. T 5 B 500 milliwatts is equivalent to: If an ammeter calibrated in amperes is used to measure a 3000-milliampere current, the reading would show: A frequency readout calibrated in megahertz shows a reading of 3.525 MHz, if calibrated in kilohertz it would show: 1,000,000 picofarads is the same as: 0.5 watts. T5B05 3 amperesT5B06 3525 kHzT5B07 1 microfard T5B08 7

  8. T 5 B 3 dB is the approximate amount of change, measured in decibels (dB) of a power increase from 5 watts to 10 watts.T5B09 The approximate amount of change, measured in decibels (dB) of a power decrease from 12 watts to 3 watts is -6 dB.T5B10 8

  9. T 5 B The approximate amount of change, measured in decibels (dB), of a power increase from 20 watts to 200 watts is 10 dB.T5B11 28,400 kHz is equal to: If a frequency readout shows a reading of 2425 MHz, it can be read as: 28.400MHz T5B12 2.425 GHzT5B13 9

  10. T 5 C The ability to store energy in an electric field is called capacitance. T5C01 The basic unit of capacitance is the farad.T5C02 The ability to store energy in a magnetic field is called Inductance. T5C03 The basic unit of inductance is the henry. T5C04 The unit of frequency is the Hertz. T5C05 The abbreviation “RF” refers to radio frequency signals of all types. T5C06 10

  11. T 5 C The usual name for Electromagnetic waves that travel through space are radio waves.T5C07 11

  12. T 5 C The formula used to calculate electrical power in a DC circuit is Power (P) equals voltage (E) multiplied by current (I).T5C08 12 12

  13. T 5 C The power being used in a circuit when the applied voltage is 13.8 volts DC and the current is 10 amperes is: T5C09 • The power being used in a circuit when the applied voltage is 13.8 volts DC and the current is 10 amperes is: T5C09 • Solving for “P” so cover up the P and plug in the other two numbers • E is given as 13.8 volts and I is given as 10 amperes P = I x E P = 10 x 13.8 P = 138 Watts

  14. T 5 C The power being used in a circuit when the applied voltage is 12 volts DC and the current is 2.5 amperes is:T5C10 Solving for “P” so cover up the “P” and plug in the other two numbers E is given as 12 volts and I is given as 2.5 amperes P = I x E P = 2.5 x 12 P = 30 watts

  15. T 5 C The amount of current flowing in a circuit when the power in a circuit is 120 watts and the applied voltage is 12 volts is:T5C11 Solving for “I” so cover up the “I” and plug in the other two numbers P is given as 120 watts and E is given as 12 volts and I = P / E I = 120  12 I = 10 Amperes 15

  16. T 5 C Impedance is a measure of the opposition to AC current flow in a circuit. T5C12 The unit of impedance is the ohm. T5C13 16

  17. T 5 D The formula used to calculate current in a circuit is Current (I) equals Voltage (E) divided by Resistance (R).T5D01 17 17

  18. T 5 D This formula us used to calculate voltage in a circuit: Voltage (E) equals Current (I) multiplied by Resistance (R). T5D02 18

  19. T 5 D This formula us used to calculate resistance in a circuit: Resistance (R) equals Voltage (E) divided by Current (I).T5D03 19 19

  20. T 5 D The resistance of a circuit in which a current of 3 amperes flows thru a resistor connected to 90 volts is: T5D04 R = E / I R = 90  3 R = 30 Ohms 20 20

  21. T 5 D The resistance of a circuit in which the applied voltage is 12 volts and the current flow is 1.5 amperes is: T5D05 R = E / I R = 12  1.5 R = 8 Ohms 21 21

  22. T 5 D The resistance of a circuit that draws 4 amperes from a 12-volt source is: T5D06 R = E / I R = 12  4 R = 3 Ohms 22 22

  23. T 5 D The current flowing thru a 80-ohm resistor connected across 120 volts is: T5D07 I = E / R I = 120  80 I = 1.5 Amperes 23 23

  24. T 5 D The current flowing thru a 100-ohm resistor connected across 200 volts is: T5D08 I = E / R I = 200  100 I = 2 Amperes 24 24

  25. T 5 D The current flowing thru a 24-ohm resistor connected across 240 volts is: T5D09 I = E / R I = 240 24 I = 10 Amperes 25 25

  26. T 5 D The voltage across a 2-ohm resistor if a current of 0.5 amperes flows thru it is:T5D10 E = I x R E = 0.5 x 2 E = 1 Volt 26 26

  27. T 5 D The voltage across a 10-ohm resistor if a current of 1 amperes flows thru it is: T5D11 E = I x R E = 1.0 x 10 E = 10 Volts 27 27

  28. T 5 D The voltage across a 10-ohm resistor if a current of 2 amperes flows thru it is: T5D12 E = I x R E = 2.0 x 10 E = 20 Volts 28 28

  29. Ohms Law Wheel 29

  30. Element 2 Technician Class Question Pool T 5 A – T 5 D Valid July 1, 2014 Through June 30, 2018

  31. T5A01Electrical current is measured in which of the following units? Volts Watts Ohms Amperes 31

  32. T5A02 Electrical power is measured in which of the following units? Volts Watts Ohms Amperes 32

  33. T5A03What is the name for the flow of electrons in an electric circuit? Voltage Resistance Capacitance Current 33

  34. T5A04 What is the name for a current that flows only in one direction? Alternating current Direct current Normal current Smooth current 34

  35. T5A05 What is the electrical term for the electromotive force (EMF) that causes electron flow? Voltage Ampere-hours Capacitance Inductance 35

  36. T5A06How much voltage does a mobile transceiver usually require? About 12 volts About 30 volts About 120 volts About 240 volts 36

  37. T5A07Which of the following is a good electrical conductor? Glass Wood Copper Rubber 37

  38. T5A08Which of the following is a good electrical insulator? Copper Glass Aluminum Mercury 38

  39. T5A09 What is the name for a current that reverses direction on a regular basis? Alternating current Direct current Circular current Vertical current 39

  40. T5A10Which term describes the rate at which electrical energy is used? Resistance Current Power Voltage 40

  41. T5A11What is the basic unit of electromotive force? The volt The watt The ampere The ohm 41

  42. T5A12What term describes the number of times per second that an alternating current reverses direction? Pulse rate Speed Wavelength Frequency 42

  43. T5B01 How many milliamperes is 1.5 amperes? 15 milliamperes 150 milliamperes 1,500 milliamperes 15,000 milliamperes 43

  44. T5B02What is another way to specify a radio signal frequency of 1,500,000 hertz? 1500 kHz 1500 MHz 15 GHz 150 kHz 44

  45. T5B03How many volts are equal to one kilovolt? One one-thousandth of a volt One hundred volts One thousand volts One million volts 45

  46. T5B04How many volts are equal to one microvolt? One one-millionth of a volt One million volts One thousand kilovolts One one-thousandth of a volt 46

  47. T5B05Which of the following is equivalent to 500 milliwatts? 0.02 watts 0.5 watts 5 watts 50 watts 47

  48. T5B06 If an ammeter calibrated in amperes is used to measure a 3000-milliampere current, what reading would it show? 0.003 amperes 0.3 amperes 3 amperes 3,000,000 amperes 48

  49. T5B07If a frequency readout calibrated in megahertz shows a reading of 3.525 MHz, what would it show if it were calibrated in kilohertz? 0.003525 kHz 35.25 kHz 3525 kHz 3,525,000 kHz 49

  50. T5B08How many microfarads are 1,000,000 picofarads? 0.001 microfarads 1 microfarad 1000 microfarads 1,000,000,000 microfarads 50

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