Light-emitting diode (LED) bulbs last ___ times longer than incandescent bulbs.
A) 5
B) 10
C) 15
D) 25
Correct Answer:
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Q20: Geothermal energy has a disadvantage of being
Q21: The elemental gas hydrogen is abundant in
Q22: Which is not a disadvantage of hydrogen
Q23: The best energy source is
A)coal
B)petroleum
C)hydrogen
D)wind power
E)energy conservation
Q24: As a general rule, winter thermostat settings
Q25: What percentage of the energy used, does
Q27: Light bulbs are now rated in _
Q28: Most electronic equipment, if plugged into a
Q29: What percent of the energy from burning
Q30: Plug-in hybrid vehicles may require the burning
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