Illustration Impedance phasor - real part and imaginary part in the complex plane

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Impedance (complex resistance) represented as a phasor $$\boldsymbol{Z}$$ in a complex plane. The complex plane together with the phasor forms a phasor diagram.

The phasor rotates counterclockwise. Here it was shown at a certain point in time. The phasor has a real part $$R$$ and an imaginary part $$X$$, which is called reactance.

The real part and the imaginary part of $$\boldsymbol{Z}$$ uniquely define the phasor in the plane:$$\boldsymbol{Z} ~=~ R ~+~ \text{i} \, X$$