Definition/Summary The impedance of a load (a combination of components) in an AC current is a complex number [itex]Z\ =\ R+jX[/itex] where [itex]R[/itex] is the resistance of the load and [itex]X[/itex] is its reactance. It can also be written in polar form: [itex]Z\ =\ |Z|e^{j\phi}[/itex], or as the phasor [itex]|Z|\angle\phi[/itex]. Impedance is the AC equivalent...
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