laboratory electronics reading 6

(a) In your own words, define output impedance.
Output impedance is the total resistance of all of the circuitry inside the power source. For instance, any resistors, capacitors, inductors, etc that are inside the voltage source would be considered part of the output impedance. Because of the complex nature and frequency dependence of the capacitors and inductors, we need to keep all of these terms together to ensure we have a correct number for the output impedance as a function of time. 
(b) In your own words, define input impedance.
Input impedance is the total impedance attached to the voltage source. We want to keep this as large as possible to make sure that we don't create an voltage divider between the source and the load.