ENSC 220
ELECTRIC CIRCUITS I
Puzzle #7: Magic box
Contributed by Professor Yannis Tsividis
You go to the lab, and
connect a battery across the terminals of a black box. Then, using the
instruments on the bench, you measure the following:
Voltage across the terminals: 1 V.
Current entering the box: 2 A.
Power dissipation of the box (measured by a watt meter): 0 W.
What is in the box?
Last modified: Fri Oct 23 17:28:40 PDT 1998.