NS LEARING Flashcards
Learing about energy
what is energy
the ability to do work
what is a source of energy
something that’s stores energy or provides energy that can be used
what are fossil fuels
fuels that were made from living matter a long time ago
what are the most common fossil fuels
oil,gas and coal
T/F is fossil fuels running out
T
what happens when you burn fossil fuels
it creates carbon dioxide which contributes to global warming
what is global warming
gradual increase in the earth’s temperature because of gasses released such as COz when fossil fuels burn,trapping radiation within the atmosphere
what is coal used for in SA
coal is used to make electricity,petrol and other synthetic fuels
what can oil be used to make
petrol,diesel and paraffin
SA doesn’t produce enough oil so what doese SA have to do
SA has to import oil from other countries
where has gas reserves been found
under the sea near mossil bay
what is the name of the gas reserve called near mossil bay
ot is called PetroSA
what doese PetroSA do
thay convert the gas in to other synthetic oil for the equivalent of 45 000 barrels of importexd crude oil daily
what doese nuclear power stations produce
heat energy when atoms are split in substances like urainium
T/F are power stations expensive
T
T/F in SA there are many big rivers and lakes for hydropower
FALSE THERE ARE NOT MANY
what dam is the best source for hydropower in SA
Cahora Bassa on the zambezi river in mozambique
how many ME or KW DOESE the dam produce
190 MW
why doese SA usually not use wave and tidal power
SA doesn’t usually use it because SA doesn’t have suitible wave conditions and /or waves are usually too strong
T/F in parts of he world the rise and fall of the waves are or movement of the waves is generated by electricity
true
what is our most important source of energy
the sun
after billions of years what will happen to the sun
it will burn out but for human life we consider the sun as a non renewable resource
T/F THE SUN’S ENERGY CAN BE USED AT NIGHT TOO AND HOW
true,it can be. the sun’s heat heats up a type of salt to about 565 degrees the salt is used to heat water,producing steam wich creates electricity and this allows solar power stations to operate at night or during bad weather condition
what is stored in all plant matter but mostly in wood and where can we get energy from
the sun is stored in all plenty matter but mostly in wood and we can get energy from animal dung
