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ASVAB · Circuits and Ohm's Law

A circuit has a voltage of 12V and a resistance of 4 Ω. What is the current?

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Correct answer

3 A

  1. A 48 A
  2. B 3 A
  3. C 0.5 A
  4. D 2 A

Why this is the answer

Ohm's Law: I = V/R = 12/4 = 3 amperes. Ohm's Law links the three basic quantities: voltage (V, volts) = current (I, amperes) × resistance (R, ohms). Rearranged for current, I = V ÷ R. The distractor 48 A multiplies instead of dividing (12 × 4), 0.5 A divides the wrong way (4 ÷ 12 ≈ 0.33, rounded), and 2 A is a near-miss. On the ASVAB, remember the triangle: cover the quantity you want and the other two show the operation.
Source: ASVAB EI, Ohm's Law

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About this topic: Circuits and Ohm's Law

Circuits and Ohm's Law questions ask you to calculate voltage, current, resistance or power, and to understand series versus parallel circuits — how resistance adds in series and reduces in parallel, and what happens when one component fails. This is one of 17 Electronics Information questions on circuits and ohm's law, each with a full explanation on a single study page.

New to this exam? Our ASVAB exam guide explains the format, scoring, and how to prepare.

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