Red Seal Electrician Practice
AC theoryQuestion 505 of 1506

A vector is 60 V @ 140 degrees. What is its rectangular form, rounded?

  1. 46, j39
  2. -46, j39
  3. -39, j46
  4. 46, -j39
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Correct answer: -46, j39

The reference angle is 40 degrees. X = 60 cos 40 = 46 and Y = 60 sin 40 = 39. In quadrant 2, X is negative.

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