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The transistor turns the voltage input into a proportional current. Then it is said the resistor Rd turns the current back into a voltage. Then to calculate the output impedance of this circuit you would take Rd in parallel with the transisor's r

_{0}.

But If you add a load resistor to the voltage output, then you will be adding it in

**parallel**with the output resistance, not in series. This doesn't make sense if it is a voltage source output. Hopefully you can see my confusion.

Thanks