3.1b Flashcards
Give 4 examples of non-renewable energy sourcrs
Crude Oil
Nuclear Fission
Coal
Natural Gas
Give 4 examples of renewable energy sources
Geothermal
Solar
Wind
Biomass
What is Geothermal energy?
Geothermal energy uses the heat in the Earth’s core - either from rocks and water near the surface or through drilling deep wells. Geothermal energy is widely used (directly and indirectly) in several other countries including the US, Philippines, Italy, Mexico, Indonesia, Japan and New Zealand.
How does wave and tidal power give us energy?
Tidal energy is produced through the use of tidal energy generators. These large underwater turbines are placed in areas with high tidal movements, and are designed to capture the kinetic motion of the ebbing and surging of ocean tides in order to produce electricity.
What are the disadvantages of wave and tidal energy?
Wave and tidal power technologies are comparatively new and largely unexplored compared with efforts to harness solar and wind energy.
Development costs are high, meaning they are unlikely to be able to compete economically with conventional power sources in the near future.
What is the total power of waves breaking on the world’s coastlines?
2 to 3 million megawatts, according to the US energy department.
What is a disadvantage of solar energy?
Solar is possibly the most expensive form of renewable energy, and is rarely economical except for localised generation.
What are the stages involved in generating hydroelectric energy?
- Rainfall (and snowmelt) that drains into rivers and flows to dams downstream.
- There water is channelled to turn a turbine, producing energy in a generator - the amount being determined by the flow or drop of the water.
What are the advantages of hydroelectric energy?
Once a dam is built, hydropower is a very cheap source of energy - with added advantages of no carbon dioxide emissions, or vulnerability to fuel price.
Which country produces almost 99% of its domestic electricity from hydro stations?
Norway
What is the difference between fission and fusion?
FISSION involves the decay of certain large atomic nuclei such as uranium-235, which releases a large amount of energy.
FUSION works on the principle that energy can be released by forcing together light atomic nuclei rather than by splitting heavy ones.
What is the largest single source of the world’s electricity (40%)
oil
What type of energy can potentially generate electricity by using the temperature difference between deep ocean water and surface water which has been warmed by the Sun.
Ocean Energy
What is an advantage of Hydrogen as an energy source?
It is non-polluting.
Biofuels are making an impact on which industry gradually?
Car industry - more cars are being produced worldwide that can run on biofuels or a mix of fuels.
