5.3 Fuel Types and Uses II Flashcards
geothermal energy produces electricity how
uses heat generated from within the Earth to heat or cool buildings, or to produce electricity
geothermal heat is a product of what
radioactive decay
radioactive decay
a naturally occurring process that occurs in the rocks and releases heat that is absorbed by underground reservoirs
what are the main methods that people get access to geothermal energy
direct use systems and deep geothermal systems
direct use geothermal systems get energy from where
naturally heated water from geysers, hot springs, etc.
how do direct use geothermal systems get the energy
they drill a well into the reservoirs of the hot water stuff and then they pump it out and the thermal energy from the water is used to do stuff directly
what makes more electricity deep geothermal systems or direct use geothermal systems
deep geothermal systems
how do deep geothermal systems work
why do deep geothermal systems make more energy
bc they go deeper than reservoirs and into the earths surface for hot water
how do deep geothermal systems work
water is pumped up from the earths surface and the decrease in pressure causes the water to become steam, which pushes a turbine to turn on an electric generator to make energy and stuff
why is geothermal energy more reliable than other energy sources
bc its not dirty and always available bc there’s always gonna be geothermal heat in the world while there might not be sun or wind
geothermal energy space benefit
not alot of it needed bc u js take from the ground
disadvantages of using geothermal energy
has toxic chemicals in steam
may cause earthquakes
limited access bc a lot of it is found at rock structures
how does geothermal energy taking out stuff cause earthquakes
when you inject the ground it gets disturbed
where are geothermal resources usually found
near tectonic boundaries
Hydroelectric power
renewable energy source that uses the movement of water to generate electricity
Most common hydroelectric systems
Dam, reservoir, tidal energy, micro hydropower
Dam
a structure built across a river to hold back water and raise the water level
Reservoir
The water stored behind the dam, which creates an artificial lake
Do bigger or smaller dams make more energy and why
Bigger bc water will fall from a higher place so there will be more energy
How do dams make energy
The reservoir water falls down and pushes a turbine to make electricity
advantages of dams
lots of water that can be used for other things too
Make lots of energy
don’t emit lots of greenhouse gasses
disadvantages of dams (4)
limit resources (like sediments) for ppl who are downstream of the dam
can cause floods (in the reservoir area) which harm ecosystems and economies
a bunch of nutrients build up in the reservoir and the microbes release greenhouse gasses when they decompose them
the dam could break and cause flooding
microhydropower systems
small installations that can produce energy for a single place
