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How much current is required to deliver 120 watts at a voltage of 12 volts DC?

10 amperes.

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  1. 0.1 amperes
  2. 12 amperes
  3. 10 amperes ✔

Why: Rearrange the power formula to I = P divided by E. Dividing 120 watts by 12 volts gives 10 amperes.

Huh, didn't know that: At 24 volts, the same 120 watts would require 5 amperes.

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Why did 120 watts cut itself into 12-volt slices? So everyone got 10 amps.
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References

Answer: 10 amperes. Rearrange the power formula to I = P divided by E. Dividing 120 watts by 12 volts gives 10 amperes.

  1. NCVEC 2026-2030 Technician Question Pool, T5C11 ncvec.org/downloads/2026-2030%20Technician%20Pool%20and%20Syllabus%20Public%20Release%20Feb%2019%202026.pdf
    B. 10 amperes
    Checked 2026-10-09.

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