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Ham Technician 7/01/2018-6/30/2022 > SUBELEMENT T5 – Electrical principles: math for electronics; electronic principles; Ohm’s Law – [4 Exam Questions - 4 Groups] > Flashcards

SUBELEMENT T5 – Electrical principles: math for electronics; electronic principles; Ohm’s Law – [4 Exam Questions - 4 Groups] Flashcards

1
Q

T5A01 (D)

Electrical current is measured in which of the following units?

A

D. Amperes

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2
Q

T5A02 (B)

Electrical power is measured in which of the following units?

A

B. Watts

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3
Q

T5A03 (D)

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

A

D. Current

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4
Q

T5A04 (B)

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

A

B. Direct current

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5
Q

T5A05 (A)

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

A

A. Voltage

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6
Q

T5A06 (A)

How much voltage does a mobile transceiver typically require?

A

A. About 12 volts

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7
Q

T5A07 (C)

Which of the following is a good electrical conductor?

A

C. Copper

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8
Q

T5A08 (B)

Which of the following is a good electrical insulator?

A

B. Glass

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9
Q

T5A09 (A)

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

A

A. Alternating current

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10
Q

T5A10 (C)

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

A

C. Power

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11
Q

T5A11 (A)

What is the unit of electromotive force?

A

A. The volt

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12
Q

T5A12 (D)

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

A

D. Frequency

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13
Q

T5A13 (A)

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

A

A. Series

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14
Q

T5A14 (B)

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

A

B. Parallel

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15
Q

T5B01 (C)

How many milliamperes is 1.5 amperes?

A

C. 1500 milliamperes

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16
Q

T5B02 (A)

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

A

A. 1500 kHz

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17
Q

T5B03 (C)

How many volts are equal to one kilovolt?

A

C. One thousand volts

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18
Q

T5B04 (A)

How many volts are equal to one microvolt?

A

A. One one-millionth of a volt

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19
Q

T5B05 (B)

Which of the following is equal to 500 milliwatts?

A

B. 0.5 watts

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20
Q

T5B06 (C)

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

A

C. 3 amperes

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21
Q

T5B07 (C)
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

C. 3525 kHz

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22
Q

T5B08 (B)

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

A

B. 1 microfarad

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23
Q

T5B09 (B)

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

A

B. 3 dB

24
Q

T5B10 (C)

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

A

C. -6 dB

25
Q

T5B11 (A)

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

A

A. 10 dB

26
Q

T5B12 (A)

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

A

A. 28.400 MHz

27
Q

T5B13 (C)

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

A

C. 2.425 GHz

28
Q

T5C01 (D)

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

A

D. Capacitance

29
Q

T5C02 (A)

What is the basic unit of capacitance?

A

A. The farad

30
Q

T5C03 (D)

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

A

D. Inductance

31
Q

T5C04 (C)

What is the basic unit of inductance?

A

C. The henry

32
Q

T5C05 (A)

What is the unit of frequency?

A

A. Hertz

33
Q

T5C06 (A)

What does the abbreviation “RF” refer to?

A

A. Radio frequency signals of all types

34
Q

T5C07 (B)

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

A

B. Electromagnetic

35
Q

T5C08 (A)

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

A

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

36
Q

T5C09 (A)

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

A. 138 watts

37
Q

T5C10 (B)

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

B. 30 watts

38
Q

T5C11 (B)

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

A

B. 10 amperes

39
Q

T5C12 (A)

What is impedance?

A

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

40
Q

T5C13 (D)

What are the units of impedance?

A

D. Ohms

41
Q

T5C14 (D)

What is the proper abbreviation for megahertz?

A

D. MHz

42
Q

T5D01 (B)

What formula is used to calculate current in a circuit?

A

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

43
Q

T5D02 (A)

What formula is used to calculate voltage in a circuit?

A

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

44
Q

T5D03 (B)

What formula is used to calculate resistance in a circuit?

A

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

45
Q

T5D04 (B)

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

A

B. 30 ohms

46
Q

T5D05 (C)

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

A

C. 8 ohms

47
Q

T5D06 (A)

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

A

A. 3 ohms

48
Q

T5D07 (D)

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

A

D. 1.5 amperes

49
Q

T5D08 (C)

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

A

C. 2 amperes

50
Q

T5D09 (C)

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

A

C. 10 amperes

51
Q

T5D10 (A)

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

A

A. 1 volt

52
Q

T5D11 (B)

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

A

B. 10 volts

53
Q

T5D12 (D)

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

A

D. 20 volts

54
Q

T5D13 (B)

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

A

B. It is unchanged

55
Q

T5D14 (A)

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

A

A. It divides between them dependent on the value of the components

56
Q

T5D15 (C)

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

A

C. It is determined by the type and value of the components

57
Q

T5D16 (D)

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

A

D. The same voltage as the source

Ham Technician 7/01/2018-6/30/2022 (10 decks)

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