Electric current is measured in which SI units?
a) watts.
b) joules.
c) amperes.
d) coulombs.
c
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Spherical Mirrors: Suppose you wanted to start a fire using a mirror to focus sunlight. Which of the following statements is most accurate?
A. It would be best to use a plane mirror. B. It would be best to use a convex mirror. C. It would be best to use a concave mirror, with the object to be ignited positioned at the center of curvature of the mirror. D. It would be best to use a concave mirror, with the object to be ignited positioned halfway between the mirror and its center of curvature. E. One cannot start a fire using a mirror, since mirrors form only virtual images.
Suppose that at a certain instant of time, the wave function shown below describes a certain quanton’s state. If we were to perform an experiment to locate the quanton, what would be the least likely result or results within the graph’s range? 
A. 
B. 
C. 
D. 
Which of the following provides observational evidence that quasars have power sources that are fairly small in size?
A) Some quasars are more than a thousand times as luminous as the Milky Way. B) Quasars are always located very far away. C) Telescopic images show the very small power sources of quasars. D) The galaxies in which quasars are embedded often show disruption from the central energy source. E) Some quasars can change significantly in apparent brightness in just a few hours.
The current through two identical light bulbs connected in series is 0.25 A. The voltage across both bulbs is 110 V. The resistance of a single light bulb is
A) 22 ohms. B) 44 ohms. C) 220 ohms. D) 440 ohms. E) none of the above