The number of molecules in one mole of a substance
A) depends on the molecular weight of the substance.
B) depends on the atomic weight of the substance.
C) depends on the density of the substance.
D) depends on the temperature of the substance.
E) is the same for all substances.
Answer: E
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If the charge carriers are positive instead of negative, what difference will result when measuring the Hall voltage?
A. There is no difference. B. Hall voltages will be double for positive charge carriers. C. Hall voltages will be double for negative charge carriers. D. The polarity of the voltage will be reversed. E. Hall voltages cannot be measured for positive charge carriers.
The energy dissipated in a light bulb in a circuit is provided by the
A) lamp filament itself. B) wires leading to the lamp. C) voltage source. D) none of the above
The number of vibrations per second of an electromagnetic wave is referred to as its
A) energy B) frequency C) speed D) wavelength
An electric motor produces 2.0 hp in a Vrms = 120 V circuit. What is Irms for this motor? (1 hp = 746 W)
a. 12 A c. 0.62 A b. 6.2 A d. 1.6 A