Red Seal Electrician Practice
AC theoryQuestion 504 of 1506

A vector is 20 V @ 30 degrees. What is the X component?

  1. 17.3 V
  2. 10 V
  3. 20 V
  4. 34.6 V
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Correct answer: 17.3 V

X = 20 x cos 30 = 20 x 0.866 = 17.3 V. The Y component is 20 x sin 30 = 10 V.

Source: Trigonometry and Single Phase AC Generation for Electricians (Flinn), 2.3: Polar vs. Rectangular Form

Practice ac theory

Questions last reviewed: 18 October 2026