A phasor is a complex number representation of a sinusoidal function that is often used in electrical engineering and signal processing, particularly when analyzing alternating current (AC) circuits. The concept simplifies the mathematical treatment of sinusoidal signals by converting time-domain waveforms into the frequency domain.
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A phasor is a complex amplitude representing a sinusoid at one specified angular frequency: . Its modulus gives the peak amplitude and its complex argument gives the wave phase in this convention. Both may instead use root mean square magnitudes if that normalization is stated.