My hair dryer is rated at 1500. watts and my television only uses 100. watts, so why do I pay more for electricity for my TV than for my hair dryer in a year?
What will be an ideal response?
One pays for energy, not power. I use my TV so much longer that its energy usage (power X time) is more than the hair dryer.
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An electric motor produces 2.0 hp in a Vrms = 120 V circuit. Using 1 hp = 746 W, how long would it take this motor to do 1.0 kWh of work?
a. 0.67 min b. 0.67 h c. 1.3 min d. 1.3 h
The actual source of wind energy is
A. the daily rotation of the Earth on its axis. B. the tides. C. the lunar cycle. D. solar energy.
Nuclear Reactions: In the nuclear reaction 
K + 
H ? X + 
Ca, what is X?
A. proton B. neutron C. 2H D. 3H E. alpha particle
Temperature differences between nighttime and daytime on Earth are relatively small due to
A) polar regions absorbing most solar energy. B) Earth being 70% water. C) Earth's relatively high daily spin rate and shortness of nighttime. D) seasonal fluctuations and Earths magnetic field.