7I Energy And Sustainable Living Flashcards
Global warming theory
The earth is getting warmer and can lead to huge problems such as slowing or starvation
What is a fuel
A fuel contains a store of energy
What is the law of conservation of energy
Energy can not be created or destroyed only transferred
What does non renewable mean
It means they can not be replaced - once they are used they are used
What is a biomass fuel obtained from
From plants or from animal waster . As it rots away methane gas is produced . This is the same as natural gas .
Example of a biomass fuel
Wood , it is also renewable
Examples of energy resources which do not produce carbon dioxide
Nuclear, hydroelectric, solar, geothermal, wind
What can we use instead of diesel and name disadvantages of using it
Biodiesel- made from vegetable oil
Not many filling stations with biodiesel
Advantages of geothermal power
Clean cheap renewable”e
Disadvantages of geothermal power
Only possible in certain parts of the world where hot rocks are near the surface of the earth
Advantage of burning fossil fuels
Cheap
Disadvantages of burning fossil fuels
Non renewable
Produces carbon dioxide which causes global warming
Advantages of nuclear
Does not produce harmful gases
Disadvantages of nuclear
Expensive non renewable and produces radioactive substances which cause cancer and are difficult to get rid of.
Advantages of solar power
Clean renewable
Disadvantages of solar power
No elect city at night or if there is very little sun
Solar panels do not collect a lot of heat energy
Solar cells are expensive and take up a lot of space
Advantages of hydroelectric power
Clean renewable
Hydroelectric power disadvantages
Reservoirs take up huge amounts of space and destroy the countryside
Only works in wet mountain regions
Adavantages of wind
Clean renewable
Disadvantages of wind
Not produced if there is put wind
Wind turbines are noisy and many are needed to make sufficient electricity
Some think it spoils the countryside
Advantages of wave power
Clean renewable
Disadvantages of waves
Doesn’t produce much electricity
Won’t work in calm waters
Advantages of tidal
Clean renewable
Disadvantages of tidal
Only works on some rivers
Dams can affect wildlife
Tidal generators can affect fish or shipping
Advantages of biomass
Renewable
Adds less carbon dioxde then fossil fuels
Disadvantages of biomass
Still adds some carbon dioxide
Needs large areas of land to grow crops
Unit for measuring energy
Joules most food is measure in kJ
1kj=1000j
Where does most energy come from
The sun . Sunlight provides us with the energy plants need to grow . Coal , oil and natural gas are from dead plants and animal remains
Wind is caused by the sun heating up the earth
Clouds form from evapourated water which eventually falls back to earth as rain so hydroelectric
Which three energy resources do not depend on the sun
Tidal uses tides caused by the gravity of the moon
Nuclear uses nuclear energy stored in uranium
Geothermal uses heat from underground rocks
