Helpful Tips for the ASVAB Electronic Information Test

By Angie Papple Johnston

When it comes to the ASVAB Electronic Information subtest, don’t feel like you have to know as much as Ben Franklin to get a passing score. Just keep a few basic principles in mind, and use your common sense.

If a question asks, “What’s the safest way to run an extension cord to a reading light?” the answer “across the middle of the floor” is probably going to be wrong.

You can also figure out quite a few answers if you remember these units of measure:

  • Current: Amperes (or amps)
  • Voltage: Volts
  • Resistance: Ohms
  • Power: Watts
  • Energy: Watt-hours

If you commit the following principles to memory, you’ll have an easier time succeeding on the Electronics Information subtest:

  • Ohm’s law: Current = Voltage / Resistance
  • Power Watts = Voltage (volts) × Current (amperes) or P = EI.
  • Current flows from a negative pole to a positive pole.
  • A closed circuit must exist for electricity to flow. (Think NASCAR.)
  • Alternating current (AC) changes direction constantly at a constant rate. The number of times a current completes two alternations of direction per second is known as its frequency; the unit of measurement for frequency is the hertz (Hz).
  • Electronic devices operate at very high frequencies.
  • Electronic devices often require a specific capacitive or inductive reactance to work. Capacitors and inductors are devices used in circuits to provide the type of reactance needed.
  • Devices that change alternating current to direct current are called rectifiers.
  • A transistor can amplify a signal.