Biomass/Geothermal
Going with the wave
Walking on sunshine...
Gone with the wind !!
Rocket science
100
What is material such as wood, manure, and grain—that makes up living organisms or comes from living organisms.
Biomass
100
What generates hydropower ?
Turbines turned by moving water.
100
What is the purpose of photovoltaic cells?
To convert solar energy directly into electrical energy
100
In what ways can wind turbines be dangerous ?
Migrating birds can get stuck in them
100
How is hydrogen gas converted to heat ?
Through combustion
200
What are solids, liquids and gases
Biomass energy source
200
Hydropower dams can provide electricity and may control __________.
Floods
200
Name a cost and benefit of solar power?
Benefits: Unlimited No pollution New jobs to make solar devices Costs: Some pollution during manufacture Living a cloudy region Devices are expensive.
200
True or False: The cost of wind power has been increasing?
False, wind power costs have been decreasing steadily because wind turbines have become more efficient
200
What is: 2H2O --> 2H2 + O2 ?
Electrolysis
300
How do we access geothermal energy?
By drilling deep below ground; steam turns turbines, generating electricity.
300
What converts heat energy in the ocean to electricity?
Ocean thermal energy conversion (OTEC)
300
Compare and contrast passive and active solar heating.
Passive: Uses sunlight to heat buildings directly and solar buildings have large windows that face south. Active: Uses technology to capture and store sun’s energy, to heat water or heat a building.
300
List three parts of a wind turbine ?
Blade, gearbox, generator
300
What happens in a fuel cell?
H2 and O2 react to form water, producing electricity
400
Why are geothermal energy sources not always truly sustainable? (3 examples)
Geothermal power plant uses heated water more quickly than groundwater is replaced and can run out of water. The water from some hot springs may contain chemicals that can damage equipment. Geothermal plants are Limited to locations where heated groundwater can be tapped with relative ease.
400
Describe one process of producing electricity from the movement of tides
A dam is built across a bay and as the tide rises, water passes through the barrier as it enters the bay or river. When the tide falls, the tidal water leaves the bay, passes through the dam, and is channeled through turbines.
400
What happens in the process of active solar heating?
A liquid is heated by the sun as it flows through solar collectors. The hot liquid is then pumped through heat exchangers, which heats water for the building.
400
How are wind and solar energy related?
The sun heats the atmosphere, and unequal heating of air masses causes winds to blow.
400
What are two costs and two benefits of using hydrogen as a fuel source?
Benefits: Unlimited supply of hydrogen in the universe Yields water and heat a byproducts Costs: Splitting water is expensive (hydrolysis) Hydrogen gas must be compressed in order to be transported
500
What are two benefits and two costs of biomass energy?
Benefits: No net change in atmospheric carbon dioxide Can be produced by all nations Costs: Takes away land from food crops or natural habitats. Deforestation, soil erosion, and desertification can result if plant biomass is harvested too rapidly. Large energy input is needed. Burning biomass indoors can lead to indoor air pollution.
500
What are the characteristics of an ideal site for harnessing tidal energy?
A long, narrow bay is ideal, since there is an especially big difference in height between high and low tides.What are the characteristics of an ideal site for harnessing tidal energy?
500
Describe two features of a house that would promote passive solar heating.
Large windows to let in sunlight during the day, which is absorbed by walls and floors and is converted to heat. Windows have to face south.
500
How do wind turbines make electricity?
A wind turbine works the opposite of a fan. Instead of using electricity to make wind, like a fan, wind turbines use wind to make electricity. The wind turns the blades, which spin a shaft, which connects to a generator and makes electricity.
500
How is electricity produced in a fuel cell?
Hydrogen gas enters at the negative electrode and oxygen gas enters at the positive electrode creating a series of reactions: Electric current flows from the negative terminal to the positive terminal, and oxygen and hydrogen ions combine to form molecules of water
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