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What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it?

1 volt.

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  1. 1 volt ✔
  2. 0.25 volts
  3. 1.5 volts

Why: Use E = I x R. Multiplying 0.5 ampere by 2 ohms gives 1 volt.

Huh, didn't know that: That 2-ohm resistor would turn 0.5 watt of power into heat.

The dad joke
Why was the 2-ohm resistor so laid back? Half an amp only gave it 1 volt of stress.
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References

Answer: 1 volt. Use E = I x R. Multiplying 0.5 ampere by 2 ohms gives 1 volt.

  1. NCVEC 2026-2030 Technician Question Pool, T5D10 ncvec.org/downloads/2026-2030%20Technician%20Pool%20and%20Syllabus%20Public%20Release%20Feb%2019%202026.pdf
    A. 1 volt
    Checked 2026-10-09.

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