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Electronics Information Practice Test

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Current, circuits, components and electrical safety, with circuit diagrams. 15 questions in 10 minutes.

Reviewed by Guilherme Correia, active-duty U.S. Air Force

1. Choose a test

2. Choose a version

Four versions, no question repeated between them. Take a new one each time so the score measures what you learned, not what you remember.

3. Choose the timing

Free, no signup. Your answers stay on this device.

Sample Electronics Information questions, with the answers

The first 3 of the 15 questions in version A of this subtest, exactly as the test asks them. Every question on the test comes with an explanation like these after you answer.

  1. 1. The unit used to measure electrical resistance is the

    • A. ampere
    • B. ohm
    • C. watt
    • D. volt

    Answer: B. Resistance is measured in ohms, written with the Greek letter omega. One ohm equals one volt per ampere. The volt measures voltage, the ampere measures current, and the watt measures power, so those are units of other quantities.

    Remember: Volts push, amperes flow, ohms resist, watts measure the rate energy is used.

    Checked against OpenStax College Physics 2e, 20.2 Ohm's Law: Resistance and Simple Circuits.

  2. 2. In the circuit shown, a 12-volt battery is connected to a single 4-ohm resistor. What is the current?

    +12 VR1 = 4 Ω
    • A. 16 amperes
    • B. 0.33 ampere
    • C. 48 amperes
    • D. 3 amperes

    Answer: D. Ohm's law gives current as voltage divided by resistance: I = V / R = 12 / 4 = 3 amperes. Multiplying the numbers (48) or dividing them the wrong way (0.33) are the common slips.

    Remember: I = V / R. Cover the quantity you want in the V over I times R triangle and the other two show the operation.

    Checked against OpenStax College Physics 2e, 20.2 Ohm's Law: Resistance and Simple Circuits.

  3. 3. A hair dryer draws 10 amperes from a 120-volt outlet. How much power does it use?

    • A. 12 watts
    • B. 110 watts
    • C. 1,200 watts
    • D. 130 watts

    Answer: C. Electric power is current times voltage: P = I x V = 10 x 120 = 1,200 watts. Adding the numbers (130) or dividing them (12) does not give power.

    Remember: Power in watts equals amperes times volts (P = IV).

    Checked against OpenStax College Physics 2e, 20.4 Electric Power and Energy.

The format of all ten subtests, how the AFQT is scored and how to study for it are on the ASVAB practice test hub.

What Electronics Information covers

Voltage, current and resistance, Ohm's law, power, series and parallel circuits, AC and DC, components, magnetism, meters, schematic symbols, safety, semiconductors and wire. The circuits are drawn from the same numbers the answer key is checked against.

It does not count toward your AFQT. It feeds the line scores and composites each service uses to match you to jobs: see how the Army, Navy, Air Force and Marine Corps use it, or take the full ASVAB.

FAQ

ASVAB practice test: frequently asked questions

Do the science and technical subtests count toward the AFQT?
No. The AFQT uses only Arithmetic Reasoning, Mathematics Knowledge, Word Knowledge and Paragraph Comprehension. General Science, Electronics Information, Auto and Shop Information, Mechanical Comprehension and Assembling Objects feed the composite scores (line scores) each service uses to decide which jobs you qualify for, so they matter once your AFQT gets you in. On the computer test Auto and Shop are separate subtests, combined into one Auto and Shop (AS) score.
How many questions is Electronics Information on the ASVAB, and how long do you get?
15 questions in 10 minutes on the computer version given at a MEPS or MET site (the CAT-ASVAB), without tryout questions; the paper version has 20 in 9 minutes. This practice test uses the computer format and limit. Source: officialasvab.com, What to Expect.
What does the ASVAB Electronics Information subtest cover?
Voltage, current and resistance, Ohm's law, power, series and parallel circuits, AC and DC, components, magnetism, meters, schematic symbols, safety, semiconductors and wire. The circuits are drawn from the same numbers the answer key is checked against.
Does Electronics Information count toward the AFQT, and which jobs use it?
No. Electronics Information is not part of the AFQT, so it does not affect whether you can enlist; it affects which jobs you qualify for. It feeds these service composites: Army line scores: Electronics (EL, GS+AR+MK+EI), General Maintenance (GM, GS+AS+MK+EI), Mechanical Maintenance (MM, NO+AS+MC+EI). Navy composites: Technical 2 (Tech 2, AR + EI + GS + MK), Technical 3 (Tech 3, EI + GS + MC). Air Force MAGE composites: Electronic (E, AR + MK + EI + GS). Marine Corps line scores: Mechanical (MM, AR + MC + AS + EI), Electrical (EL, AR + EI + GS + MK).
Is the ASVAB timed?
Yes. On the computer version given at a MEPS or MET site, each of the ten subtests has its own time limit. Without tryout questions: General Science 15 questions in 12 minutes, Arithmetic Reasoning 15 in 55, Word Knowledge 15 in 9, Paragraph Comprehension 10 in 27, Mathematics Knowledge 15 in 31, Electronics Information 15 in 10, Auto Information 10 in 7, Shop Information 10 in 6, Mechanical Comprehension 15 in 22 and Assembling Objects 15 in 18: 135 questions in 197 minutes. The testing program says almost all examinees finish each subtest before the time expires. The at-home PiCAT has no time limits on the individual subtests.
Can you use a calculator on the ASVAB?
No. The testing program states that you cannot use a calculator when taking the ASVAB, because the ability to do math by hand may be required on the job. This practice test is built the same way: every math question can be solved on scratch paper.
Can you go back to a question on the ASVAB?
Not on the computer version. The testing program says that because the CAT-ASVAB is adaptive, you cannot change an answer once you have moved on to the next question. On the paper version you can review your answers within a subtest. The timed mode of this practice test works like the computer version.
What is the AFQT, and is it a different test?
It is not a separate test. The AFQT is a score computed from four ASVAB subtests: Arithmetic Reasoning, Mathematics Knowledge, Word Knowledge and Paragraph Comprehension. DoD's technical bulletin gives the formula as AR + MK + 2 times VE, where VE combines Word Knowledge and Paragraph Comprehension. The result is reported as a percentile from 1 to 99 against a national sample of 18 to 23 year olds tested in 1997. The officer selection tests, such as the AFOQT, are different exams.

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Next steps

Army ASVAB Jobs

Every MOS and its line score

Air Force ASVAB Jobs

Every AFSC and its minimum

Navy ASVAB Ratings

Every rating and its line score

First-Year Pay

What you earn in your first year

officialasvab.com (What to Expect, Scores, FAQs, CAT-ASVAB, PiCAT, retest policy), ASVAB Technical Bulletin No. 4, Segall (2004), DoDI 1145.01, and each service's recruiting site, read October 3, 2026

Results are estimates. Always verify with your finance office.

Reviewed by Guilherme Correia · Military Toolkit editorial

Military Toolkit is not affiliated with the Department of Defense or the ASVAB testing program. The questions are original practice material, not ASVAB questions.