2.6 Flashcards
renewable
energy generated from natural resources
non renewable
comes from sources that will run out
fossil fuels release what when burned?
what can this be used for?
release energy when burnt
•used to generate electricity for our home
3 fossil fuels
natural gas
oil
coal
wind
2 advantages
free
no pollution
wind
2 disadvantages
noise pollution
doesn’t work in calm weather/storms
solar
2 good
no pollution
useful in portable devices
solar
2 bad
nothing at night
expensive
hydroelectric
2 good
reliable
produced quickly
hydroelectric
2 bad
floods
expensive
wave
2 good
no pollution
free energy source
wave
2 bad
unreliable
produce not much energy
biomass
2 good
reliable
lots of electricity
biomass
bad
emit greenhouse gases
nuclear fuels produce energy from what?
nuclear fission
problems of nuclear fuels
2
- disposal of waste- non renewable so must be stored safely
* radioactive emissions- harmful to life
how is electricity distributed through the national grid via high-voltage cables:
step up transformers
used in power stations to produce the very high voltages needed to transmit electricity through the TNG power lines
step down transformers
use
used locally to reduce the voltage to safe levels
as step up too dangerous to use
step up
increase/decrease
increase
step down increase or decrease
decrease
pylons and high voltage cables
cancer
radioactive emissions
harmful to life so waste from nuclear power stations has to be stored in a safe place until radiation falls to safe levels
what is crude oil
a mixture of compounds called hydrocarbons
complete combustion of a hydrocarbon always produces what
carbon dioxide + water
what does the chemical formula CbH2n+2 mean
always twice plus 2 the amount of hydrogen atoms as carbon atoms
