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What formula is used to calculate resistance in a circuit?

R = E / I.

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  1. R = E / I ✔
  2. R = E x I
  3. R = E + I

Why: Ohm's law gives resistance by dividing voltage by current. In symbols, R = E divided by I.

Huh, didn't know that: Ohm's law is named for German physicist Georg Simon Ohm.

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Why did the resistor do math homework? To find out just how resistant it was.
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References

Answer: R = E / I. Ohm's law gives resistance by dividing voltage by current. In symbols, R = E divided by I.

  1. NCVEC 2026-2030 Technician Question Pool, T5D03 ncvec.org/downloads/2026-2030%20Technician%20Pool%20and%20Syllabus%20Public%20Release%20Feb%2019%202026.pdf
    B. R = E / I
    Checked 2026-10-09.

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