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From: austin@UW-BEAVER.ARPA
Newsgroups: net.ham-radio
Subject: Thevinin/Norton equivalents
Message-ID: <1983@brl-tgr.ARPA>
Date: Tue, 8-Oct-85 09:24:30 EDT
Article-I.D.: brl-tgr.1983
Posted: Tue Oct  8 09:24:30 1985
Date-Received: Fri, 11-Oct-85 07:11:24 EDT
Sender: news@brl-tgr.ARPA
Lines: 65

This is an old one but most people I've met have not seen it. If you
solve it in less than an hour, give yourself an 'A'.

The problem is as follows:

You are given 2 black boxes. One contains a perfect 1 volt voltage
source with a 1 ohm resistor in series connected to 2 external
terminals ( assume 0 resistance wiring). The other box contains a
perfect 1 amp current source with a 1 ohm resistor in parallel with it
connected to the external terminals. Can you identify (without
opening) which box is which?

I'll post the correct answer(s).




				    /\	      /\
				   /  \      /	\
	  |------------------\	  /    \    /	 \-------------X terminal
	  |		      \  /	\  /
    /-----|-------\	       \/	 \/
   /		   \
  /		    \		    1 ohm
 /		     \
 |		     |
 \   ------------    /
  \/		 \  /
  /\		  \/
 /  \		  /\   1 volt source
/    -------------  \
|		    |
\		    /
 \		   /
  \		  /
   \------|------/
	  |
	  |-----------------------------------------------------X terminal





	  |-------------------------------------|--------------X terminal
	  |					|
    /-----|-------\				|
   /		   \				|
  /		    \				\
 /		     \				 \
 |		     |				  \
 \   ------------    /				  /
  \/		 \  /				 /
  /\		  \/   1 amp source		/  1 ohm
 /  \		  /\			       /
/    -------------  \			      /
|		    |			     /
\		    /			     \
 \		   /			      \
  \		  /			       \
   \------|------/			       |
	  |				       |
	  |------------------------------------|----------------X terminal


					Austin Mack