About Electronics Information

Electronics Information evaluates your understanding of electrical and electronic concepts. Questions cover basic electrical theory (voltage, current, resistance), circuit components (resistors, capacitors, transistors), Ohm's Law, power calculations, and practical electronics knowledge. On the CAT-ASVAB, you have 15 scored questions with a 10-minute official subtest limit. While EI does not contribute to the AFQT score, it is a key component of the EL (Electronics) composite line score, which is required for many technical military jobs in communications, radar, avionics, and computer systems.

Topics Covered

Voltage, Current & Resistance
Ohm's Law
Series & Parallel Circuits
Electrical Power & Energy
Capacitors & Inductors
Semiconductors & Transistors
AC vs. DC Current
Electrical Safety
Circuit Diagrams & Symbols
Basic Digital Electronics

Sample Questions

Sample Question 1
In a circuit, what is impedance?
  • Resistance only
  • Capacitance only
  • Total opposition to AC current flow
  • Voltage drop
Impedance is the total opposition to AC current, combining resistance, capacitance, and inductance.
Sample Question 2
What is the power consumed by a 120V device drawing 2A?
  • 60W
  • 122W
  • 240W
  • 480W
Power P = V × I = 120 × 2 = 240W.
Sample Question 3
What does AC stand for in electricity?
  • Accumulated Current
  • Alternating Current
  • Adjusted Current
  • Applied Current
AC stands for Alternating Current, which periodically reverses direction.

Study Tips for Electronics Information

Master Ohm's Law

V = IR is the foundation of electronics. Know how to calculate voltage, current, and resistance in both series and parallel circuits.

Learn Circuit Symbols

Be able to read basic circuit diagrams. Know the symbols for resistors, capacitors, batteries, switches, and ground.

Understand Power Calculations

Know the power formula P = VI and its variations. Many questions involve calculating watts, amps, or volts.