In a nonlinear device, the application of a sinusoidal voltage does not result in
a sinusoidal flow of current. These loads do not exhibit constant impedance during
the entire cycle of applied sinusoidal voltage. Nonlinearity is not the same as the
frequency dependence of impedance, that is, the reactance of a reactor changes in
proportion to the applied frequency, but it is linear at each applied frequency if we
neglect saturation and fringing. However, nonlinear loads draw a current that may
even be discontinuous or flow in pulses for a part of the sinusoidal voltage cycle.
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