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D - Science - Ch 9
Renewable Sources of Energy
Question | Answer |
---|---|
How does a solar house capture energy? | it uses active solar collectors on the roof and large windows on south and west sides that act as passive solar collectors |
What does the equipment on the roof and in the basement of a solar house do? | Active solar cells on the roof generate electricity that can be stored in the basement and the water that is heated is stored in a tank in the basement and used to heat the house |
What is solar energy? | energy from the sun |
What is the source of most other renewable energy resources? | solar energy |
When will solar energy run out? | not for billions of years |
When is solar energy available? | only when the sun is shining |
How do some solar plants capture energy and use it to generate electricity? | rows of giant mirrors focus the sun's rays to heat a tank of water, then the water boils making steam that can be used to generate electricity |
What can solar energy be converted into? | electricity in a solar cell |
What are solar cells used to power? | calculators, lights and other small devices |
What converts sunlight into electricity in a solar cell? | solar heating systems |
How do active solar heating systems differ from passive solar heating systems? | they use fans and pumps to distribute the heat |
What are other renewable sources of energy besides the sun? | water, wind, biomass fuels, geothermal energy & hydrogen |
What is an indirect form of solar energy that electricity produces by flowing water? | hydroelectric power |
Hydroelectric power is the most widely used source of what? | renewable energy in the world today |
What are 2 limitations on hydroelectric power in the US? | most of the suitable rivers have already been dammed and can have negative effects on the environment |
What is the fastest growing energy source? | wind energy |
What are fuels made from living things? | biomass fuels |
What is intense heat from Earth's interior called? | geothermal energy |
Geothermal energy is an unlimited source of what? | cheap energy |
What is the obstacle to using hydrogen as a fuel? | it take more energy to obtain pure hydrogen than is produced by burning the hydrogen |