ASVAB CampElectronics Information (EI)
Knowledge of electricity and electronics. It feeds the line scores used for job qualification.
- 15 questions
- 10 minutes
- ~40 s per question
- Line scores
- No calculator
- 12 lessons · 14 h
Lessons
12 lessons · 480 practice questions · 96 flashcards- 01Electric Charge, Current and VoltageExplain electron/proton charge and conservation, conductors and insulators, fields and induction, current and conventional direction, voltage as energy per charge, batteries, simple switches and meters; calculate I = Q/t, V = E/Q, simple V = IR, P = VI and SI conversions with original worked examples.80 min40 questions8 cards
- 02Resistance and ConductorsExplain resistance and resistivity; distinguish conductors, insulators, ionic conductors and semiconductors; use R=V/I and R=ρL/A with correct units; reason about wire length, cross section, temperature, resistors and safe measurement.80 min40 questions8 cards
- 03Ohm's LawApply V=IR to voltage, current, and resistance, convert SI prefixes, interpret V–I data, make simple series/parallel extensions and power calculations while recognizing constant-resistance assumptions and electrical safety.80 min40 questions8 cards
- 04Electrical Power and EnergyUse relationships among power, voltage, current and energy.35 min40 questions8 cards
- 05Series CircuitsIdentify and analyze ideal DC series circuits using current conservation, total resistance, voltage division, Ohm's law, open/short fault models, and basic safe metering concepts.65 min40 questions8 cards
- 06Parallel CircuitsAnalyze ideal DC parallel resistor circuits using shared-node voltage, branch current, equivalent resistance, power, faults and series–parallel reduction.60 min40 questions8 cards
- 07AC and DCDistinguish AC, steady and pulsating DC, graph waveforms, calculate period, frequency, RMS/peak and basic resistive power, and identify rectifier, inverter and transformer functions.64 min40 questions8 cards
- 08Circuit Components and SymbolsRecognize switches, resistors, capacitors, diodes, lamps, fuses and schematic conventions.75 min40 questions8 cards
- 09Semiconductors and Basic Electronic DevicesIdentify p/n doping and P–N junctions; explain diode/LED/Zener/photodiode operation and BJT/MOSFET switching; solve supplied idealized resistor, power and gain questions.65 min40 questions8 cards
- 10Magnetism and ElectromagnetismExplain magnetic poles, current-produced fields, electromagnets, right-hand rules, magnetic flux and Faraday/Lenz induction; solve fundamental force, flux and inductive-energy problems.70 min40 questions8 cards
- 11Motors, Generators and TransformersExplain motors, generators and AC transformers and solve original EI-level induction, ideal turns-ratio, efficiency, back-emf and generator-frequency problems.82 min40 questions8 cards
- 12Electrical Safety and TroubleshootingRecognize and respond safely to electrical hazards; distinguish fault/protective-device functions; analyze schematic-only open, short, leakage and overcurrent cases using elementary physics.85 min40 questions8 cards
Electronics Information practice tests
6 tests · each 15 questions · 10 min · no question repeats between tests
About this section
Electronics Information covers electricity, circuits and electronic components. It does not count toward the AFQT, but services use it in composites for electrical, communications and many technical jobs.
This category has 12 lessons. You begin with electric charge, current and voltage, then resistance and conductors, Ohm's law, and electrical power and energy. Circuit lessons cover series circuits, parallel circuits, AC and DC, and circuit components and symbols. Later lessons explain semiconductors and basic electronic devices, magnetism and electromagnetism, and motors, generators and transformers, finishing with electrical safety and troubleshooting.
Many EI questions come down to a formula and a diagram, so practice reading schematics as you go and keep a short sheet of the key relationships between voltage, current, resistance and power. A lesson test follows every lesson, letting you confirm each idea before the next one builds on it.
Take it with you: the free app
The same 124 lessons, 6,516 questions and 82 timed practice tests on your phone, plus flashcards with spaced review and progress tracking. Free to download, and it works offline.
- Works offline
- Spaced-review flashcards
- Progress for every subtest
- Menus in 59 languages
English ▾