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ham radio technician license (2018-2022) > Sub-Element T5 Electrical principles [4 Exam Questions] > Flashcards

Sub-Element T5 Electrical principles [4 Exam Questions] Flashcards

1
Q

Electrical current is measured in which of the following units?

A

Amperes

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2
Q

Electrical power is measured in which of the following units?

A

Watts

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3
Q

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

A

Current

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4
Q

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

A

Direct current

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5
Q

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

A

Voltage

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6
Q

How much voltage does a mobile transceiver typically require?

A

About 12 volts

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7
Q

Which of the following is a good electrical conductor?

A

Copper

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8
Q

Which of the following is a good electrical insulator?

A

Glass

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9
Q

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

A

Alternating current

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10
Q

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

A

Power

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11
Q

What is the unit of electromotive force?

A

The volt

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12
Q

What describes the number of times per second that an alternating current makes a complete cycle?

A

Frequency

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13
Q

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

A

Series

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14
Q

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

A

Parallel

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15
Q

How many milliamperes is 1.5 amperes?

A

1500 milliamperes

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16
Q

What is another way to specify a radio signal frequency of 1,500,000 hertz?

A

1500 kHz

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17
Q

How many volts are equal to one kilovolt?

A

One thousand volts

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18
Q

How many volts are equal to one microvolt?

A

One one-millionth of a volt

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19
Q

Which of the following is equal to 500 milliwatts?

A

0.5 watts

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20
Q

If an ammeter calibrated in amperes is used to measure a 3000-milliampere current, what reading would it show?

A

3 amperes

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21
Q

If a frequency display calibrated in megahertz shows a reading of 3.525 MHz, what would it show if it were calibrated in kilohertz?

A

3525 kHz

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22
Q

How many microfarads are equal to 1,000,000 picofarads?

A

1 microfarad

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23
Q

What is the approximate amount of change, measured in decibels (dB), of a power increase from 5 watts to 10 watts?

A

3 dB

24
Q

What is the approximate amount of change, measured in decibels (dB), of a power decrease from 12 watts to 3 watts?

A

-6 dB

25
Q

What is the amount of change, measured in decibels (dB), of a power increase from 20 watts to 200 watts?

A

10 dB

26
Q

Which of the following frequencies is equal to 28,400 kHz?

A

28.400 MHz

27
Q

If a frequency display shows a reading of 2425 MHz, what frequency is that in GHz?

A

2.425 GHz

28
Q

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

A

Capacitance

29
Q

What is the basic unit of capacitance?

A

The farad

30
Q

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

A

Inductance

31
Q

What is the basic unit of inductance?

A

The henry

32
Q

What is the unit of frequency?

A

Hertz

33
Q

What does the abbreviation “RF” refer to?

A

Radio frequency signals of all types

34
Q

A radio wave is made up of what type of energy?

A

Electromagnetic

35
Q

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

A

Power (P) equals voltage (E) multiplied by current (I)

36
Q

How much power is being used in a circuit when the applied voltage is 13.8 volts DC and the current is 10 amperes?

A

138 watts

37
Q

How much power is being used in a circuit when the applied voltage is 12 volts DC and the current is 2.5 amperes?

A

30 watts

38
Q

How many amperes are flowing in a circuit when the applied voltage is 12 volts DC and the load is 120 watts?

A

10 amperes

39
Q

What is impedance?

A

A measure of the opposition to AC current flow in a circuit

40
Q

What is a unit of impedance?

A

Ohms

41
Q

What is the proper abbreviation for megahertz?

A

MHz

42
Q

What formula is used to calculate current in a circuit?

A

Current (I) equals voltage (E) divided by resistance (R)

43
Q

What formula is used to calculate voltage in a circuit?

A

Voltage (E) equals current (I) multiplied by resistance (R)

44
Q

What formula is used to calculate resistance in a circuit?

A

Resistance (R) equals voltage (E) divided by current (I)

45
Q

What is the resistance of a circuit in which a current of 3 amperes flows through a resistor connected to 90 volts?

A

30 ohms

46
Q

What is the resistance in a circuit for which the applied voltage is 12 volts and the current flow is 1.5 amperes?

A

8 ohms

47
Q

What is the resistance of a circuit that draws 4 amperes from a 12-volt source?

A

3 ohms

48
Q

What is the current in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms?

A

1.5 amperes

49
Q

What is the current through a 100-ohm resistor connected across 200 volts?

A

2 amperes

50
Q

What is the current through a 24-ohm resistor connected across 240 volts?

A

10 amperes

51
Q

What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it?

A

1 volt

52
Q

What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it?

A

10 volts

53
Q

What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it?

A

20 volts

54
Q

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

A

It is unchanged

55
Q

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

A

It divides between them dependent on the value of the components

56
Q

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

A

It is determined by the type and value of the components

57
Q

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

A

The same voltage as the source

ham radio technician license (2018-2022) (10 decks)

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