To get all the voltage from a source to a target without loss you need voltage bridging, that is a relative low output impedance to a higher input impedance. Usualy the input impedance is more than ten times higher then the output impedance.
An input impedance is called also a load impedance or an external impedance.
An output impedance is called also a source impedance or an internal impedance.
reflected impedence is a tool to analyse resonant coupling..
Newer heard the word "impedence". An output impedance is an AC resistance at the output of an electronic device.
Max efficiency of energy transfer can only occur when impedence source matches the impedence of the load.
A buffer amplifier can be used to transform high input impedence to low output impedence, or vice-versa.
Resistance divided by impedence
480 volts and 60ohm impedence current = volt/impedence current=480/60 current=8ampeares
Yes, you can plug an electric guitar into an acoustic amplifier. But I would suggest that you don't play at a high volume for a long period of time of the difference in impedence - an acoustic guitar (and bass and vocals) is low impedence, where an electric guitar (& keyboard) is high impedence.
Impedence
to calculate impedence of power supply
remais same.......
This question makes no sense, however, one answer may be to determine the impedence of the computer. The conductivity would be the reciprocal of the impedence. At full power a computer with a 200 amp power supply would have an impedence of approximately .02 ohms. If so, the conductivity would be 50 mhos. Difficult and confusing question.... best I can do.
While it is possible it is not wise. There eill be a mismatch of everything from the power to the load and this will ultimately damage the equipment. Most car speakers are meant to run on a different impedence that home speakers.