The light bulb used in a slide projector draws a current of 4 amperes when operating on 120 volts. (a) What is the bulb's resistance? (b) What is the bulb's power consumption?
(a) 30 ohms, (b) 480 watts
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Power: For the graph shown in the figure, what physical quantity does the slope of the graph represent for a dc circuit?
A. resistivity B. resistance C. energy D. current E. capacitance
Disregarding the effects of friction, a cyclist will coast farther when a lamp powered by a wheel generator is
A) of low wattage. B) of high wattage. C) turned off. D) none of the above
The apparent positions of stars around the sun during an eclipse have been used to prove the general theory of relativity
a. True b. False Indicate whether the statement is true or false
Suppose we represent Earth with a basketball. On this scale, most of the air in Earth's atmosphere would fit in a layer that is ________
A) about an inch thick B) about 6 inches thick C) about the thickness of a sheet of paper D) about a half-inch thick