Extra exam question E5C01
Subelement E5, ELECTRICAL PRINCIPLES· Group E5C
Which of the following represents pure capacitive reactance of 100 ohms in rectangular notation?
- A.0 - j100 (correct answer)
- B.0 + j100
- C.100 - j0
- D.100 + j0
WhyPure capacitive reactance of 100 ohms is written in rectangular notation as 0 - j100. In rectangular notation, a pure capacitive reactance is written with zero real part and a negative imaginary part, so 100 ohms of pure capacitive reactance is written as 0 - j100, answer A. A positive imaginary part, 0 + j100, would represent inductive reactance instead, and the two options with a nonzero real part and zero imaginary part describe pure resistance, not reactance.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
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