How many questions are in subelement T5?

The current pool contains 50 questions in subelement T5.

technician pool

Subelement T5 question review

All 50 official questions with the exact winning phrase marked.

T5A01T5A

Electrical current is measured in which of the following units?

DAmperes

Why this answer

The key fact is Amperes. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

E = I × R

T5A02T5A

Electrical power is measured in which of the following units?

BWatts

Why this answer

The key fact is Watts. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

P = E × I

T5A03T5A

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

DCurrent

T5A04T5A

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

CFrequency

Why this answer

The key fact is Frequency. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

E = I × R

T5A05T5A

A difference in which of the following causes electron flow?

AVoltage

T5A06T5A

What is the unit of frequency?

AHertz

T5A07T5A

Why are metals generally good conductors of electricity?

BThey have many free electrons

T5A08T5A

Which of the following is a good electrical insulator?

BGlass

T5A09T5A

Which of the following describes alternating current?

CCurrent that alternates between positive and negative directions

Why this answer

The key fact is Current that alternates between positive and negative directions. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

E = I × R

T5A10T5A

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

CPower

T5A11T5A

What type of current flow is opposed by resistance?

DAll these choices are correct

Why this answer

The key fact is All these choices are correct. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

E = I × R

T5B01T5B

How many milliamperes is 1.5 amperes?

C1500 milliamperes

T5B02T5B

Which is equal to 1,500,000 hertz?

A1500 kHz

T5B03T5B

Which is equal to one kilovolt?

COne thousand volts

T5B04T5B

Which is equal to one microvolt?

AOne one-millionth of a volt

T5B05T5B

Which is equal to 500 milliwatts?

B0.5 watts

Why this answer

The key fact is 0.5 watts. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

P = E × I

T5B06T5B

Which is equal to 3000 milliamperes?

D3 amperes

T5B07T5B

Which is equal to 3.525 MHz?

C3525 kHz

T5B08T5B

Which is equal to 1,000,000 picofarads?

B1 microfarad

T5B09T5B

Which decibel value most closely represents a power increase from 5 watts to 10 watts?

B3 dB

Why this answer

The key fact is 3 dB. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

P = E × I

T5B10T5B

Which decibel value most closely represents a power decrease from 12 watts to 3 watts?

C-6 dB

Why this answer

The key fact is -6 dB. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

P = E × I

T5B11T5B

Which decibel value represents a power increase from 20 watts to 200 watts?

A10 dB

Why this answer

The key fact is 10 dB. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

P = E × I

T5B12T5B

Which is equal to 28400 kHz?

D28.400 MHz

T5B13T5B

Which is equal to 2425 MHz?

C2.425 GHz

T5C01T5C

What describes the ability to store energy in an electric field?

DCapacitance

T5C02T5C

What is the unit of capacitance?

AFarad

T5C03T5C

What describes the ability to store energy in a magnetic field?

DInductance

T5C04T5C

What is the unit of inductance?

CHenry

T5C05T5C

What is the unit of impedance?

DOhm

T5C06T5C

What is the abbreviation for kilohertz?

AkHz

T5C07T5C

What is the abbreviation for megahertz?

DMHz

T5C08T5C

What formula is used to calculate electrical power (P) in a DC circuit?

AP = I x E

Why this answer

The key fact is P = I x E. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

P = E × I

T5C09T5C

How much power is delivered by a voltage of 13.8 volts DC and a current of 10 amperes?

A138 watts

Why this answer

The required value is 138 watts. Keep the units with the number so a nearby distractor cannot pull you away from the result.

E = I × R

T5C10T5C

How much power is delivered by a voltage of 12 volts DC and a current of 2.5 amperes?

B30 watts

Why this answer

The required value is 30 watts. Keep the units with the number so a nearby distractor cannot pull you away from the result.

E = I × R

T5C11T5C

How much current is required to deliver 120 watts at a voltage of 12 volts DC?

B10 amperes

Why this answer

The required value is 10 amperes. Keep the units with the number so a nearby distractor cannot pull you away from the result.

E = I × R

T5C12T5C

What is impedance?

AThe opposition to AC current flow

T5D01T5D

What formula is used to calculate current in a circuit?

BI = E / R

Why this answer

The key fact is I = E / R. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

E = I × R

T5D02T5D

What formula is used to calculate voltage in a circuit?

AE = I x R

Why this answer

The key fact is E = I x R. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

E = I × R

T5D03T5D

What formula is used to calculate resistance in a circuit?

BR = E / I

Why this answer

The key fact is R = E / I. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

E = I × R

T5D04T5D

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

B30 ohms

Why this answer

The key fact is 30 ohms. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

E = I × R

T5D05T5D

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

C8 ohms

Why this answer

The key fact is 8 ohms. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

E = I × R

T5D06T5D

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

A3 ohms

Why this answer

The key fact is 3 ohms. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

E = I × R

T5D07T5D

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

D1.5 amperes

Why this answer

The key fact is 1.5 amperes. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

E = I × R

T5D08T5D

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

C2 amperes

Why this answer

The key fact is 2 amperes. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

E = I × R

T5D09T5D

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

C10 amperes

Why this answer

The key fact is 10 amperes. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

E = I × R

T5D10T5D

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

A1 volt

Why this answer

The key fact is 1 volt. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

E = I × R

T5D11T5D

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

B10 volts

Why this answer

The key fact is 10 volts. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

E = I × R

T5D12T5D

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

D20 volts

Why this answer

The key fact is 20 volts. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

E = I × R

T5D13T5D

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

ASeries

Why this answer

The key fact is Series. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

E = I × R

T5D14T5D

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

BParallel

Why this answer

The key fact is Parallel. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

E = I × R