Which of the following statements is NOT correct regarding the vector method in AC circuit analysis?

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  1. The vector method is used to represent sinusoidal AC quantities.
  2. The vector method helps in determining the phase difference between voltage and current.
  3. Phasors in the vector method rotate in a clockwise direction in the complex plane.
  4. Phasor diagrams are used to solve AC circuit problems involving impedance.

Answer (Detailed Solution Below)

Option 3 : Phasors in the vector method rotate in a clockwise direction in the complex plane.
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Representation of a vector

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  • A phasor is a rotating vector used to represent a sinusoidal waveform (like voltage or current) in AC analysis. It simplifies calculations involving sinusoidal signals by converting time-varying functions into complex numbers.
  • The vector method helps in determining the phase difference between voltage and current.
  • The phasor tip rotates from the real axis toward the imaginary axis, i.e., counterclockwise.
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