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What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it?

10 volts.

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  1. 11 volts
  2. 10 volts ✔
  3. 9 volts

Why: Use E = I x R. One ampere multiplied by 10 ohms gives 10 volts.

Huh, didn't know that: With one ampere flowing, the numerical voltage equals the resistance.

The dad joke
One amp walked through a 10-ohm resistor. The bill came to exactly 10 volts.
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References

Answer: 10 volts. Use E = I x R. One ampere multiplied by 10 ohms gives 10 volts.

  1. NCVEC 2026-2030 Technician Question Pool, T5D11 ncvec.org/downloads/2026-2030%20Technician%20Pool%20and%20Syllabus%20Public%20Release%20Feb%2019%202026.pdf
    B. 10 volts
    Checked 2026-10-09.

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