Ohm's Law: If a quantity you calculated has units of 
, what is that quantity?
A. potential
B. resistivity
C. resistance
D. capacitance
E. charge
Answer: A
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Two wires with the same resistance have the same diameter but different lengths. If wire 1 has length L1 and wire 2 has length L2, how do L1 and L2 compare if wire 1 is made from copper and wire 2 is made from aluminum? The resistivity of copper is 1.7 × 10^–5 ?·m and the resistivity of aluminum is 2.82 × 10^–5 ?·m
a. L1 = 1.7 L2 b. L1 = 0.60 L2 c. L1 = 2.8 L2 d. L1 = 0.36 L2
If two slide projectors are connected in parallel across the same 120 volt source, the current drawn from the source in amperes is
a. 3 b. 6 c. 9 d. 12 e. none of the above
What causes some asteroids leave the asteroid belt and sometimes approach Earth?
A. Because Earth's gravitational field attracts them. B. Because Jupiter's gravitational field ejects them. C. Because they crash into one another and get ejected.
Plane polarized light of intensity 
is passed through a polarizer oriented at 45 
to the original plane of polarization. What is the intensity transmitted?
A. 0.70 
B. 0.50
C. 0.35 
D. 0.25 
E. 0.00