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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

(57 cards)

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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?

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?

25
T5B11 (A) | What is the amount of change, measured in decibels (dB), of a power increase from 20 watts to 200 watts?
A. 10 dB
26
T5B12 (A) | Which of the following frequencies is equal to 28,400 kHz?
A. 28.400 MHz
27
T5B13 (C) | If a frequency display shows a reading of 2425 MHz, what frequency is that in GHz?
C. 2.425 GHz
28
T5C01 (D) | What is the ability to store energy in an electric field called?
D. Capacitance
29
T5C02 (A) | What is the basic unit of capacitance?
A. The farad
30
T5C03 (D) | What is the ability to store energy in a magnetic field called?
D. Inductance
31
T5C04 (C) | What is the basic unit of inductance?
C. The henry
32
T5C05 (A) | What is the unit of frequency?
A. Hertz
33
T5C06 (A) | What does the abbreviation “RF” refer to?
A. Radio frequency signals of all types
34
T5C07 (B) | A radio wave is made up of what type of energy?
B. Electromagnetic
35
T5C08 (A) | What is the formula used to calculate electrical power in a DC circuit?
A. Power (P) equals voltage (E) multiplied by current (I)
36
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. 138 watts
37
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?
B. 30 watts
38
T5C11 (B) | How many amperes are flowing in a circuit when the applied voltage is 12 volts DC and the load is 120 watts?
B. 10 amperes
39
T5C12 (A) | What is impedance?
A. A measure of the opposition to AC current flow in a circuit
40
T5C13 (D) | What are the units of impedance?
D. Ohms
41
T5C14 (D) | What is the proper abbreviation for megahertz?
D. MHz
42
T5D01 (B) | What formula is used to calculate current in a circuit?
B. Current (I) equals voltage (E) divided by resistance (R)
43
T5D02 (A) | What formula is used to calculate voltage in a circuit?
A. Voltage (E) equals current (I) multiplied by resistance (R)
44
T5D03 (B) | What formula is used to calculate resistance in a circuit?
B. Resistance (R) equals voltage (E) divided by current (I)
45
T5D04 (B) | What is the resistance of a circuit in which a current of 3 amperes flows through a resistor connected to 90 volts?
B. 30 ohms
46
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?
C. 8 ohms
47
T5D06 (A) | What is the resistance of a circuit that draws 4 amperes from a 12-volt source?
A. 3 ohms
48
T5D07 (D) | What is the current in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms?
D. 1.5 amperes
49
T5D08 (C) | What is the current through a 100-ohm resistor connected across 200 volts?
C. 2 amperes
50
T5D09 (C) | What is the current through a 24-ohm resistor connected across 240 volts?
C. 10 amperes
51
T5D10 (A) | What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it?
A. 1 volt
52
T5D11 (B) | What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it?
B. 10 volts
53
T5D12 (D) | What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it?
D. 20 volts
54
T5D13 (B) | What happens to current at the junction of two components in series?
B. It is unchanged
55
T5D14 (A) | 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
T5D15 (C) | What is the voltage across each of two components in series with a voltage source?
C. It is determined by the type and value of the components
57
T5D16 (D) | What is the voltage across each of two components in parallel with a voltage source?
D. The same voltage as the source

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

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