On Monday 11 November 2002 08:46, you wrote:

You have a small box whose internal workings you can't see, but the box
has two terminals. You measure these two terminals with a voltmeter, and
it measures precisely 1V. You short the two terminals with an ammeter,
and it reads precisely 1A. You then conclude the internal circuit is
either a Thevenin source (an ideal 1V voltage source with a 1-ohm series
resistor) or a Norton source (an ideal 1A current source with a 1-ohm
shunt resistor). Using standard laboratory equipment, how could you
determine which one it is.

I'm feeling pleased with myself - I honestly worked this out from scratch!

Apply a 1V external source and measure the current.

Steve