Electrical current is measured in which of the following units?
DAmperes
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 × Rtechnician pool
Subelement T5 question review
All 50 official questions with the exact winning phrase marked.
Electrical power is measured in which of the following units?
BWatts
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 × IWhat is the term for the flow of electrons in an electric circuit?
DCurrent
The key fact is Current. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.
What term describes the number of times per second that an alternating current makes a complete cycle?
CFrequency
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 × RA difference in which of the following causes electron flow?
AVoltage
The key fact is Voltage. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.
What is the unit of frequency?
AHertz
The key fact is Hertz. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.
Why are metals generally good conductors of electricity?
BThey have many free electrons
The reason is they have many free electrons. Connect the cause in the question to this direct result instead of memorizing the answer letter.
Which of the following is a good electrical insulator?
BGlass
The key fact is Glass. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.
Which of the following describes alternating current?
CCurrent that alternates between positive and negative directions
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 × RWhich term describes the rate at which electrical energy is used?
CPower
The key fact is Power. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.
What type of current flow is opposed by resistance?
DAll these choices are correct
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 × RHow many milliamperes is 1.5 amperes?
C1500 milliamperes
The required value is 1500 milliamperes. Keep the units with the number so a nearby distractor cannot pull you away from the result.
Which is equal to 1,500,000 hertz?
A1500 kHz
The key fact is 1500 kHz. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.
Which is equal to one kilovolt?
COne thousand volts
The key fact is One thousand volts. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.
Which is equal to one microvolt?
AOne one-millionth of a volt
The key fact is One one-millionth of a volt. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.
Which is equal to 500 milliwatts?
B0.5 watts
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 × IWhich is equal to 3000 milliamperes?
D3 amperes
The key fact is 3 amperes. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.
Which is equal to 3.525 MHz?
C3525 kHz
The key fact is 3525 kHz. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.
Which is equal to 1,000,000 picofarads?
B1 microfarad
The key fact is 1 microfarad. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.
Which decibel value most closely represents a power increase from 5 watts to 10 watts?
B3 dB
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 × IWhich decibel value most closely represents a power decrease from 12 watts to 3 watts?
C-6 dB
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 × IWhich decibel value represents a power increase from 20 watts to 200 watts?
A10 dB
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 × IWhich is equal to 28400 kHz?
D28.400 MHz
The key fact is 28.400 MHz. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.
Which is equal to 2425 MHz?
C2.425 GHz
The key fact is 2.425 GHz. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.
What describes the ability to store energy in an electric field?
DCapacitance
The key fact is Capacitance. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.
What is the unit of capacitance?
AFarad
The key fact is Farad. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.
What describes the ability to store energy in a magnetic field?
DInductance
The key fact is Inductance. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.
What is the unit of inductance?
CHenry
The key fact is Henry. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.
What is the unit of impedance?
DOhm
The key fact is Ohm. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.
What is the abbreviation for kilohertz?
AkHz
The key fact is kHz. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.
What is the abbreviation for megahertz?
DMHz
The key fact is MHz. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.
What formula is used to calculate electrical power (P) in a DC circuit?
AP = I x E
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 × IHow much power is delivered by a voltage of 13.8 volts DC and a current of 10 amperes?
A138 watts
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 × RHow much power is delivered by a voltage of 12 volts DC and a current of 2.5 amperes?
B30 watts
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 × RHow much current is required to deliver 120 watts at a voltage of 12 volts DC?
B10 amperes
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 × RWhat is impedance?
AThe opposition to AC current flow
The key fact is The opposition to AC current flow. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.
What formula is used to calculate current in a circuit?
BI = E / R
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 × RWhat formula is used to calculate voltage in a circuit?
AE = I x R
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 × RWhat formula is used to calculate resistance in a circuit?
BR = E / I
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 × RWhat is the resistance of a circuit in which a current of 3 amperes flows when connected to 90 volts?
B30 ohms
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 × RWhat is the resistance of a circuit for which the applied voltage is 12 volts and the current flow is 1.5 amperes?
C8 ohms
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 × RWhat is the resistance of a circuit that draws 4 amperes from a 12-volt source?
A3 ohms
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 × RWhat is the current in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms?
D1.5 amperes
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 × RWhat is the current through a 100-ohm resistor connected across 200 volts?
C2 amperes
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 × RWhat is the current through a 24-ohm resistor connected across 240 volts?
C10 amperes
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 × RWhat is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it?
A1 volt
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 × RWhat is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it?
B10 volts
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 × RWhat is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it?
D20 volts
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 × RIn which type of circuit is the current always the same through all components?
ASeries
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 × RIn which type of circuit is the voltage always the same across all components?
BParallel
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