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ARRL Ham Radio License - Technician (Level 1) > Chapter 3: Electricity, Components, and Circuits > Flashcards

Chapter 3: Electricity, Components, and Circuits Flashcards

1
Q

Electrical current is measured in what unit?

A

Amperes, amps, or A

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2
Q

What is the name for the flow of electrons in an electric circuit?

A

Current, or I

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3
Q

What is the name for a current that flows only in one direction?

A

Direct Current or DC

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4
Q

What is the electrical term for the electromotive force (EMF) that causes electron flow?

A

Voltage, Volts, or E

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5
Q

What is the name for a current that reverses direction on a regular basis?

A

Alternating Current, or AC

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6
Q

What is the unit of electromotive force?

A

Volts, or V

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7
Q

Which instrument would you use to measure electric potential or electromotive force?

A

Voltmeter, or Multimeter

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8
Q

Which instrument is used to measure electric current?

A

Ammeter, or Multimeter

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9
Q

In which type of circuit is current the same through all components?

A

Series circuit

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10
Q

In which type of circuit is voltage the same across all components?

A

Parallel circuit

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11
Q

What happens to current at the junction of two components in series?

A

The same current flows in each components

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12
Q

What happens to current at the function of two components in parallel?

A

When components are connected in parallel with a source of voltage, the voltage across each is the same as that of the source.

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13
Q

What is the voltage across each of two components in series with a voltage source?

A

When the components are connected in series with the source voltage, the voltage divides between the components, depending on their type and value

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14
Q

What is the voltage across each of two components in parallel with a voltage source?

A

The voltage divides between the components, depending on their type and value

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15
Q

What is the correct way to connect a voltmeter to a circuit?

A

Voltmeters are connected in parallel with or “across” a component or circuit to measure voltage

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16
Q

How is a simple ammeter connected to a circuit?

A

Ammeters are connected in series with a component or circuit to measure current

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17
Q

Which of the follow is a good electrical conductor?

A

Copper

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18
Q

Which of the following is a good electrical insulator?

A

Glass, ceramics, dry wood, paper, most plastics, other non-metals

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19
Q

What instrument is used to measure resistance?

A

Ohmmeter, or Multimeter

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20
Q

What formula is used to calculate current in a circuit?

A

I = E / R

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21
Q

What formula is used to calculate voltage in a circuit?

A

E= I x R

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22
Q

What formula is used to calculate resistance in a circuit?

A

R = E / I

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23
Q

Electrical power is measured in which of the following units?

A

Power is measured in Watts, or W

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24
Q

Which term describes the rate at which electrical energy is used?

A

Power, represented by P

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25
Q

What is the formula used to calculate electrical power in a DC circuit?

A

The product of voltage and current (P = E x I)

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26
Q

What is the ability to store energy in an electric field called?

A

Capacitance, measured in faraday (F)

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27
Q

What is the ability to store energy in a magnetic field called?

A

Inductance, measured in Henry’s (H)

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28
Q

What electrical component opposes the flow of current in a DC circuit?

A

Resistors

29
Q

What type of component is often used as an adjustable volume control?

A

Potentiometer

30
Q

What electrical parameter is controlled by a potentiometer?

A

Adjusts voltage or potential

31
Q

What electrical component stores energy in an electric field?

A

Capacitors

32
Q

What type of electrical component consists of two or more conductive surfaces separated by an insulator?

A

Capacitors

33
Q

What type of electrical component stores energy in a magnetic field?

A

Inductors

34
Q

What electrical component usually is constructed as a coil of wire?

A

Inductors

35
Q

What component is commonly used to change 120V AC house current to a lower AC voltage for other uses?

A

Transformer

36
Q

What is impedance?

A

A general term to mean the circuit’s opposition to AC current flow, a combination of resistance and reactance, measured in Ohms

37
Q

Which of the following is combined with an inductor to make a tuned circuit?

A

A capacitor is combined with an inductor to make a tuned circuit

38
Q

What is the main purpose of a resonant or tuned circuit?

A

A tuned circuit acts as a filter, passing or rejecting signals at its resonant frequency.

39
Q

What class of electronic component uses a voltage or current signal to control current flow?

A

Transistors

40
Q

What electronic component allows current to flow in only one direction?

A

A Semiconductor

41
Q

Which component can be used as an electronic switch or amplifier?

A

With an appropriate external circuit and a source of power, transistors can amplify or switch voltages and currents

42
Q

Which component can consist of three layers of semiconductor material?

A

Transistors

43
Q

Which electronic component can amplify signals?

A

Transistors

44
Q

How is the cathode lead of a semiconductor diode often marked on a package?

A

By a stripe mark

45
Q

What does the abbreviation LED stand for?

A

Light Emitting Diode

46
Q

What does the abbreviation FET stand for?

A

Field-Effect Transistors

47
Q

What does BJT stand for?

A

Bipolar Junction Transistors

48
Q

What are the names of the two electrodes of a diode?

A

Anode and Cathode

49
Q

Which of the following could be the primary gain-producing component in an RF power amplified?

A

RF power transistors

50
Q

What is the term that describes a device’s ability to amplify a signal?

A

Using small signals to control or amplify larger signals is called gain

51
Q

Which of the following devices or circuits changes an alternating current into a varying direct current signal?

A

Diode

52
Q

Which of the following is commonly used as a visual indicator?

A

LEDs

53
Q

What is the name of a device that combines several semiconductors and other components into one package?

A

Integrated Circuit (IC or chip)

54
Q

What electrical component is used to protect other circuit components from current overloads?

A

Fuses and circuit breakers

55
Q

What is the purpose of a fuse in an electrical circuit?

A

What the metal melts, or “blows”, the current path is broken and power is removed from circuits supplied by the fuse.

56
Q

Why is it unwise to install a 20-ampere fuse in the place of a 5-ampere fuse?

A

Using one with a higher current rating, even temporarily, could allow the fault to permanently damage the equipment or start a fire.

57
Q

What electrical component is used to connect or disconnect electrical circuits?

A

Switches and relays control current through a circuit

58
Q

What is a relay?

A

A relay is a switch controlled by an electromagnet

59
Q

What is the name of an electrical wiring diagram that uses standard component symbols?

A

Schematics

60
Q

What do the symbols on an electrical schematic represent?

A

Visual description of a circuit and its components that uses standardized drawings called circuit symbols.

61
Q

Which of the following is accurately represented in electrical schematics?

A

Each line indicates that an electrical connection exists between the component at the end of the line.

62
Q

What is the name of a circuit that generates a signal at a specific frequency?

A

An oscillator

63
Q

Which of the following describes combining speech with an RF carrier signal?

A

Modulation

64
Q

Which of the following is used to convert a radio signal from one frequency to another?

A

A mixer, combines two RF signals and shifts one of them to a third frequency

65
Q

Which of the following might damage a multimeter?

A

Trying to measure voltage or connecting the probes to an energized circuit when the meter is set to measure resistance

66
Q

Which of the following measurements are commonly made using a multimeter?

A

All three electrical values of voltage, current and resistance.

67
Q

What is probably happening when an oh meter, connected across an unpowered circuit, initially indicates a low resistance and then shows increasing resistance with time?

A

Indicates the presence of a large-value capacitor.

68
Q

Which of the following precautions should be taken when measuring high voltages with a voltmeter?

A

Ensure the voltmeter and leads are rated for use at the voltages to be measured.

69
Q

Which of the following displays an electrical quantity as a numeric value?

A

A meter provides information as a value in the form of numbers or on a numeric scale.

ARRL Ham Radio License - Technician (Level 1) (11 decks)

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