In some developed countries, the per capita energy consumption is decreasing. This could be attributed to
A. fewer people.
B. incorrect data.
C. increasing energy efficiency.
D. inefficiencies in the energy generating facilities.
E. access to cheaper oil.
查看答案
Biomass is a renewable fuel and has fewer emissions than fossil fuels; but one of the negative consequences to using it is
A. the addition of ethanol.
B. an unequal global distribution.
C. the large amounts of carbon emissions.
D. the high production expense.
E. the creation of a monoculture crop on land that could be used to produce food.
Photovoltaic cells produce energy by
A. converting light energy into electrical energy, which created an electronic current by moving protons.
B. changing solar energy into electrical energy, which creates an electric current by moving electrons.
C. using mechanical energy from wind to create an electrical current.
D. absorbing sunlight and heating water, which then produces steam to turn the turbines.
E. splitting water molecules and converting hydrogen into electrical energy.
How is wind harnessed for energy?
A. Kinetic energy is collected in turbines and converted to electrical energy.
B. Solar energy is converted into kinetic energy.
C. Kinetic energy is converted to electrical energy though photovoltaic cells.
D. Wind energy is captured and used to heat water, which then produces steam to turn turbines.
E. Winds potential energy turns the turbines which then produces electrical energy.
Which of the following statements are NOT applicable to wind power?
A. 21st century technology
B. land below turbines used for farming
C. cause of bird and bat deaths
D. zero emissions from turbines
E. disrupts ecosystem aesthetics
微信支付 
支付宝支付