energy resources

Question 1

how are energy demands met

Answer 1

burning gas coal and oil

Question 2

what is boifuel

Answer 2

taken from live or recently dead oraganisms

Question 3

properties of biofuel

Answer 3

renewable as its consantly produced and can be replaced easily as it comes from primarily vegetations or sewage
carbon neutral as the co2 made when burnt wouldve been taken in by the plant earlier

Question 4

whats a neuclear fuel

Answer 4

fueled by uraium when its neucleas spits creating energy

Question 5

explain nuclear fuel

Answer 5

when the neucleas splits it creates energy which is transfered by a fluid coolant to a heat exchanger and is veyr hot. the energy transferred turns water into steam which can turn electricity powered generators

Question 6

what is wind power

Answer 6

electric generator on a tower which is turned by the wind which increases energy

Question 7

cons of wind power

Answer 7

unreliable
noisy

Question 8

what is wave power

Answer 8

motion from the waves moves a generator up and down and generates electricity through its movement which is trasferred to the shore by a cable

Question 9

cons of wave power

Answer 9

small scale
not consant
lots of cables and buildings needed by the coast to connect the generators which spoils scenery
tidal flow patterns can be affected changing marine life and habitats

Question 10

what is hydroelectric power

Answer 10

rainwater collected flows downhill and drives turbines at the bottom

Question 11

what is tidal power

Answer 11

traps water from high tide behind a barage which is released through turbines driving generators

Question 12

what are solar cells

Answer 12

flat pannels that turn the suns radiation energy to electricity

Question 13

cons of solar pwoer

Answer 13

not relieable
expensive
needed in large amounts as fairly inefficient

Question 14

what is a solar power toweer

Answer 14

tower with thousands of mirrors which reflect the suns radiation onto water at the top which turns it to steam, which is piped ti the ground and turns energy generators

Question 15

what is geothermal energy

Answer 15

comes from radioactive substances in earth

Question 16

how does geothermal energy work

Answer 16

energy tranferred from the susbstances to rocks which heats them, then water is pumped to the heated rocks which produces steam which turns electricity turbines
the heat water can also be pumped directly to heat pipes and under floors

Question 17

cons of fossil fuels

Answer 17

releases co2 which earms atmosphere
finite
releases other pollutants such as sulfur impurities, NO2 making acid rain and particulates

Question 18

pros of neuclear power

Answer 18

no carbon emission
in large supply

Question 19

cons of neuclear power

Answer 19

prouces toxic waste
power plants are very expensive to dismantle
explostion of sorts can lead to poisoning the entire habitat around eg chernobyll
technically finite

Question 20

pros of renewabel energy sourcrs

Answer 20

will never run out
no acid rain or greenhouse gas emission
no radioactive waste
work in area that cannot connect to the grid

Question 21

cons of renewable energy

Answer 21

cant meet the worlds demand
cant make petrol and that that cars rely on
can be very unrelieable
require a lot- like water for hydroelectric and wave, wind for wind, sun for solar- buildings on the coast for wave

Question 22

what do gas fired power stations do

Answer 22

produce enegry based off when it is needed in high demand

Question 23

how energy demand is met

Answer 23

fossil fuel coal and co2 stations are very quick and reliable
gas fired stations can meed energy levels based on how much it is in demand
renewable energy is good when the conditions are right
renewable energy when demand is low so it can store energy

Question 24

what is density

Answer 24

mass at a given volume, how packed something is w particles

Question 25

examples of biofuels

Answer 25

ethanol can be extracted from sugar crops
woodwhips
waste vegetable oils and seeds

Question 26

what can help car fuels be more renewable

Answer 26

mixing petrol with biofuels

Question 27

three fossil fuels

Answer 27

coal
natural gas
crude oil

Question 28

why are biofuels carbon neutral in theory and why not in practice

Answer 28

in theory plants take in as much co2 through photosyntehsis as they will let out by combustion so their emissions are 0
but if you deforest a ;and in order to find space to grow and harvest biofuels youre halting their ability to help the worldwide total of carbon intake, and harvesting and that takes energy