Electronics Information

# Electronics Information: Circuits, Components, and Core Principles The Electronics Information (EI) subtest directly shapes your eligibility for high-demand technical jobs — it appears in the EL (Electronics) line score for the Army, the E composite for the Air Force, and in Navy nuclear ratings. On the CAT-ASVAB, EI has 15 scored questions and a 10-minute time limit (without tryout items). EI does not count toward AFQT (AFQT = AR + MK + 2(VE)); it is a line-score-only subtest. Even a modest improvement in EI can open doors to careers in communications, avionics, and electrical systems. --- ## Why Electronics Information Matters EI is not part of the AFQT, but it is one of the most job-critical line score subtests across every branch. The concepts tested are narrow and highly predictable — master Ohm's Law, series vs. parallel circuits, and basic component behavior, and you will answer the vast majority of questions correctly. --- ## The Foundation: Ohm's Law Every EI exam will test Ohm's Law in some form. Memorize this triangle cold: > V = I × R | Symbol | Stands For | Unit | |--------|-----------|------| | V | Voltage (electrical pressure) | Volts (V) | | I | Current (flow of electrons) | Amperes / Amps (A) | | R | Resistance (opposition to flow) | Ohms (Ω) | Rearrange as needed: - I = V ÷ R (current increases when voltage goes up or resistance goes down) - R = V ÷ I (resistance is what limits current for a given voltage) ### Worked Example > A circuit has a…