How much money would you save per hour by replacing a 100-watt incandescent light bulb with an equally bright 20-watt fluorescent bulb? Assume the cost for electricity to be 15 cents per kilowatt-hour.
A) 1.5 cents per hour
B) 1.2 cents per hour
C) 0.3 cent per hour
D) It's not possible to save only a fraction of a cent.
Question 2
Why are gas turbines more efficient at generating electricity than steam turbines?
A) Gas is combustible, but steam is not.
B) Electricity conducts better through the gas exhausts, which are ionized.
C) Water has a relatively high specific heat capacity.
D) Their hot combustion products provide more energy to turn the turbine.
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