Phase method: a convenient method for analyzing sinusoidal steady-state circuits. It uses complex numbers called phasors to represent sinusoidal quantities, transforming differential (integral) equations describing sinusoidal steady-state circuits into complex algebraic equations, thereby simplifying circuit analysis and calculation. This method has been widely used since it was proposed by German CP Steinmetz in 1893. A phasor can be represented by a vector on the complex plane.
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