Renewable energy resources

• use light to increase temperature • used to heat water • you pump water into cells, run it up and down into a pipe • exposes more water to sunlight which releases energy • this increases SA:VOL

• never boils the water - used for bathing and washing clothes • does not produce electricity

• can have lots of windows on the south facing walls • big, long walls south facing, shorter on the other sides • light reflective surface - lose heat (white buildings • dark absorbant surfaces - retain the heat

• heat pump contains a liquid with very low boiling point • that liquid can turn into a gas at low temps • the liquid raises its temperatures in the panel • the gas produced goes to a compresser • heat goes to a heat exchanger

• N type is doped with phosphorus and this adds electrons so is electron rich (very negative) • the p side is doped with boron electron poor - lacks negative electrons • excess electrons on the n type layer gain energy • they move to the p type sode • continuous movement of electrons = a current

• renewable energy source • job creation • doesn’t release CO2 upon combustion • safer than others

• intermittent • high initial costs • weather dependent • made with rare and finite materials

• an apparatus containing a movable mirror, used to reflect sunlight in a fixed direction

• a reflective surface used to collect or project energy such as light, sound or radio waves

• operation on a large scale • mirrors that reflect suns energy to a central point • producing salt - retain heat thats able to boil water through the night

• cells with a-rs are textured and bumpy • some structures mimic corneas of moth eyes because they are very efficient at absorbing light

• has multiple layers that each absorb different wavelengths of light • meaning more energy can be released

• mix up of old-style photothermal and are producing electricity with photovoltaic sandwich • heating water and producing electricity

• can use them as windows • increase surface that we can utilise

• hydrophobic layer on them - repels water • helps carry dust and particles with it

• the energy an object has due to its position above earth, energy due to its height

• large river catchment area • high and regular rainfall • valley with steep sides • want the water to have low turbidity

• how high the water falls • might include fast flowing upland stream schemes

• water falls from a lower distance • may include old mill sites with a weir

• operating the flow of the river without modification by upstream storage

• renewable energy source • flood control + water supply • creation of freshwater habitats • use for recreational use

• environmental impact - construction • displacement of communities • dependent on weather • cause sedimentation

• from difference in temperature pressure (caused by the sun’s energy) • air moves in an attempt to reach equilibrium

• ^ winds for a lot of the year • local constraints - may impact construction • public opposition - providing incentives • they interfere with telecommunications