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From: austin@nsc-pdc.UUCP (Austin Mack)
Newsgroups: net.analog,net.puzzle
Subject: Thevinin/Norton equivalents
Message-ID: <488@nsc-pdc.UUCP>
Date: Thu, 3-Oct-85 20:15:33 EDT
Article-I.D.: nsc-pdc.488
Posted: Thu Oct  3 20:15:33 1985
Date-Received: Fri, 4-Oct-85 15:57:34 EDT
Distribution: na
Organization: NSC Portland Development Center, Portland Oregon
Lines: 72
Xref: sabre net.analog:204 net.puzzle:238





	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