The current through a capacitor depends on the first derivative of voltage appearing
across it. Therefore, the current flow through the parasitic capacitance that is inevitably
present across any electrical element can be neglected in the circuit model for that element
only if the rate of change of electrical quantities involved in the circuit is small. Thus, a
two-terminal resistance will model a piece of conducting substance with sufficient
accuracy only if the frequency of voltage and current variables in the circuit is
sufficientlysmall.
We have seen that there is no purely resistive two-terminal element in the physical
world. A parasitic capacitance ...
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