We also introduced a circuit analysis method, solution method using impedances.

Three step methods.

First of all we draw the circuit replacing The sources with their phasors and

components with their impedances.

The next is to use the methods that we did in module two which were just like all

the resistor methods, KBL, KCL, Thevenin-Norton, Mesh Node.

Any of those methods that we're familiar with to solve this.

The key was to treat the impedances as if they were complex resistors.

And then the last step was to convert from the phasar form back to the cosine.

We introduced transfer functions.

Our motivation was to find an expression to solve for the output given an input.

In other words,find a functional relationship for

a function that relates the input to the output.

And we want to be able to solve for various frequencies,

various angles and various amplitudes of the input,

and that function, in kind of a generic form, allows us to do that.