ASVAB subject guide
Electronics information
Recognize basic electrical quantities, components, and circuit behavior.
Core review
What to study
- Voltage is potential difference, current is flow, and resistance opposes flow.
- Recognize common symbols for batteries, resistors, switches, and ground.
- Distinguish series paths from parallel branches.
Five-question review
Try original electronics information questions.
Attempt each question before opening the answer and explanation.
Electrical current is measured in:
- Volts
- Amperes
- Ohms
- Watts
Reveal answer and explanation
Correct answer: Amperes
The ampere is the unit of electric current.
A 12-volt source drives 2 amperes through a resistor. What is the resistance?
- 4 ohms
- 6 ohms
- 10 ohms
- 24 ohms
Reveal answer and explanation
Correct answer: 6 ohms
Using R = V ÷ I, resistance is 12 ÷ 2 = 6 ohms.
In a simple series circuit, the current:
- Has only one path
- Has a different source at each load
- Flows only through insulators
- Is always zero
Reveal answer and explanation
Correct answer: Has only one path
A series circuit provides one continuous path for current.
Which material is generally the best electrical conductor?
- Rubber
- Glass
- Copper
- Dry wood
Reveal answer and explanation
Correct answer: Copper
Copper has low electrical resistance and is widely used as a conductor.
What is the primary purpose of a fuse?
- Increase voltage
- Open an overcurrent circuit
- Store electric charge
- Reverse polarity
Reveal answer and explanation
Correct answer: Open an overcurrent circuit
A fuse melts and opens the circuit when current exceeds its rating.
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