What is the phasor representation of AC quantities and how are RMS values defined for sine waves?

What is the phasor representation of AC quantities and how are RMS values defined for sine waves?

• A. Phasor quantities are real numbers with magnitude only; RMS is always equal to peak.
• B. Phasor quantities are represented as vectors with only magnitude.
• C. Phasor quantities are represented as complex numbers with magnitude and angle; RMS is the DC equivalent value for power calculation, with RMS = peak/√2 for sine waves.
• D. Phasor quantities ignore magnitude and use only angle.

Answer: (C)