Electronics: Question about input/output impedance

[shiva kumar]

well can any one please explain why the input impedance of any electronic circuit should be high and why the output impedance should be low

[reachrkata]

Simple -

1) Input impedance of a system should be high so that the system does not load the source.

2) Output impedance of a system should be low so that any load connected to this system does not receive a lower voltage because of a voltage drop across the system output impedance.

-Karthik

[shiva kumar]

thanks dude