Technician T5A: Current, voltage, power and frequency
These are the 11 official questions in group T5A of the 2026–2030 Technician question pool, with the correct answer marked and a plain-English explanation of why it's right. The real exam asks one question from this group.
- T5A01Question 1
Electrical current is measured in which of the following units?
- AVolts
- BWatts
- COhms
- DAmperes Correct
Why: Current is measured in amperes (amps).
- T5A02Question 2
Electrical power is measured in which of the following units?
- AVolts
- BWatts Correct
- CWatt-hours
- DAmperes
Why: Power is measured in watts.
- T5A03Question 3
What is the term for the flow of electrons in an electric circuit?
- AVoltage
- BAmperes per second
- CVolts per second
- DCurrent Correct
Why: The flow of electrons is called current.
- T5A04Question 4
What term describes the number of times per second that an alternating current makes a complete cycle?
- APulse rate
- BWave number
- CFrequency Correct
- DWavelength
Why: The number of complete AC cycles per second is the frequency.
- T5A05Question 5
A difference in which of the following causes electron flow?
- AVoltage Correct
- BAmpere-hours
- CCapacitance
- DInductance
Why: A voltage difference pushes electrons, causing current to flow.
- T5A06Question 6
What is the unit of frequency?
- AHertz Correct
- BHenry
- CFarad
- DEpicycles per second
Why: Frequency is measured in hertz (cycles per second).
- T5A07Question 7
Why are metals generally good conductors of electricity?
- AThey have relatively high density
- BThey have many free electrons Correct
- CThey have many free protons
- DThey have relatively high Young’s modulus values
Why: Metals have many free electrons that move easily, so they conduct well.
- T5A08Question 8
Which of the following is a good electrical insulator?
- ASea water
- BGlass Correct
- CStainless steel
- DGraphite
Why: Glass has very few free electrons, so it's a good insulator.
- T5A09Question 9
Which of the following describes alternating current?
- ACurrent that alternates between a positive direction and zero
- BCurrent that alternates between a negative direction and zero
- CCurrent that alternates between positive and negative directions Correct
- DAll these answers are correct
Why: Alternating current keeps reversing between positive and negative directions.
- T5A10Question 10
Which term describes the rate at which electrical energy is used?
- AResistance
- BCurrent
- CPower Correct
- DVoltage
Why: Power is the rate at which electrical energy is used.
- T5A11Question 11
What type of current flow is opposed by resistance?
- ADirect current
- BAlternating current
- CRF current
- DAll these choices are correct Correct
Why: Resistance opposes DC, AC and RF current alike.