Input and output impedances, also called source and load impedances.It is steady and unchanging (ignoring the effect of the battery losing energy over time).
The output impedance, source impedance, or internal impedance of an electronic device is the opposition exhibited by its output terminals to an alternating current (AC) of a particular frequency as a result of resistance, inductance and capacitance. It is the Thévenin equivalent impedance looking back into the output terminals.
Try to attempt you will have an idea how to analyse impedence effect and utilize **broken link removed** for your performance.