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Welcome back to Linear Circuits, this is Dr. Ferri.

This lesson is on impedance.

Remember, the objective of this particular module is to be able to analyze circuits

like this when we've got a sinusoidal input to it.

Now we've already gone through in the last lesson and

shared how we can represent the sinusoidal input as a phasor.

Now the goal in this particular lesson is to try to represent these circuit

components as what we call impedances.

This lesson builds upon phasors, which we've already mentioned,

as well as the IV characteristics of R, L, and C components.

Remember that a capacitor has this relationship between the voltage and

the current, i is equal to C dv dt.

Now an inductor has this relationship, which is v is equal to L di dt.