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Electrical mathQuestion 153 of 1506

A vector is 80 V @ 30°. A calculator in degree mode gives which rectangular form?

  1. 40, j69.3
  2. 69.3, j40
  3. −69.3, j40
  4. 69.3, −j40
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Correct answer: 69.3, j40

X = 80 × cos 30° = 69.3 and Y = 80 × sin 30° = 40. The j goes in front of Y.

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

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Questions last reviewed: 18 October 2026