Technician exam question T5D02
Subelement T5, ELECTRICAL PRINCIPLES· Group T5D
T5D02
What formula is used to calculate voltage in a circuit?
- A.E = I x R (correct answer)
- B.E = I / R
- C.E = I2 x R
- D.E = I2 / R
WhyVoltage in a circuit is calculated with the formula E = I x R. Ohm's law gives voltage as current multiplied by resistance, E = I x R, answer A. B divides instead of multiplying, and C and D both square the current, a step that belongs to the power formula P = I-squared x R, not to Ohm's law for voltage.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2026-2030 NCVEC Element 2 pool (public domain); the explanation above is original writing, see our methodology.
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