Extra exam question E5B03
Subelement E5, ELECTRICAL PRINCIPLES· Group E5B
How is impedance in polar form converted to an equivalent admittance?
- A.Take the reciprocal of the angle and change the sign of the magnitude
- B.Take the reciprocal of the magnitude and change the sign of the angle (correct answer)
- C.Take the square root of the magnitude and add 180 degrees to the angle
- D.Square the magnitude and subtract 90 degrees from the angle
WhyConverting an impedance in polar form to its equivalent admittance means taking the reciprocal of the magnitude and reversing the sign of the angle. Converting an impedance from polar form to its equivalent admittance means taking the reciprocal of the magnitude and reversing the sign of the angle, since admittance is mathematically the reciprocal of impedance, and inverting a complex number in polar form inverts its magnitude while negating its angle, answer B. The other listed operations, inverting just the angle, taking a square root, or squaring the magnitude, don't correctly perform this reciprocal conversion.
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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