Technician Practice Test T5 – Electrical Principles and Math
Current, voltage, power, Ohm's law, metric prefixes and decibels – with worked math. Tap an answer to check it.
Score: 0 / 0 (15)
Question 1
Electrical current is measured in which of the following units?
Current is measured in amperes (amps).
Question 2
Electrical power is measured in which of the following units?
Power is measured in watts.
Question 3
What is the term for the flow of electrons in an electric circuit?
Current is the flow of electrons in a circuit.
Question 4
What term describes the number of times per second that an alternating current makes a complete cycle?
Frequency is the number of complete AC cycles per second.
Question 5
A difference in which of the following causes electron flow?
A difference in voltage (electrical pressure) makes electrons flow.
Question 6
What is the unit of frequency?
Frequency is measured in hertz (cycles per second).
Question 7
Why are metals generally good conductors of electricity?
Metals have many free electrons that move easily, so they conduct well.
Question 8
Which of the following is a good electrical insulator?
Glass does not conduct electricity, so it is a good insulator.
Question 9
Which of the following describes alternating current?
Alternating current reverses direction, flowing positive and then negative, over and over.
Question 10
Which term describes the rate at which electrical energy is used?
Power is the rate at which electrical energy is used.
Question 11
What type of current flow is opposed by resistance?
Resistance opposes every kind of current: DC, AC and RF.
Question 12
How many milliamperes is 1.5 amperes?
Milli means one thousandth: 1.5 A × 1000 = 1500 mA.
Question 13
Which is equal to 1,500,000 hertz?
1,500,000 Hz ÷ 1000 = 1500 kHz (or 1.5 MHz).
Question 14
Which is equal to one kilovolt?
Kilo means one thousand: 1 kV = 1000 V.
Question 15
Which is equal to one microvolt?
Micro means one millionth: 1 µV = 0.000001 V.
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The questions are the official public Technician pool. The rules come from FCC Part 97. Always check these sources for the current rules.