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1
Midterm #2
Physics 9HD, Fall 2009
Nov. 23, 2009
NAME_______________________________________________________________________
You are permitted to use one 8 /1/2” x 11” sheet of paper with formulas, and your calculator.
MAXIMUM SCORE IS 100 POINTS.
THE EXAM HAS 4 PROBLEMS ON 2 PAGES.
SHOW ALL
YOUR WORK. Please hand in your copy of the test with your work, so that I can see any additions
which you have made to the diagrams (e.g., assignment of currents, nodes, and loops for Problem 4.)
______________________________________________________________________________
1. (10 points) (a) Suppose you are given a black box, which you are told contains a circuit with only batteries
and resistors. You can make electrical connections to two electrical terminals on the box, which are
connected to the circuit. Using the two terminals, explain what measurements you would make in order to
determine the Thévenin equivalent voltage,
E
eq
, and Thévenin equivalent resistance, R
eq
, of the components
in the box.
(b) Now connect a resistor R across the two terminals of the black box. What is the power dissipated in R?
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 Fall '11
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 Physics, Work

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