P3- sustainable energy
- Created by: willbrewin1
- Created on: 20-04-15 19:47
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- anything that supplies electricity delivers energy
- P3- sustainable energy
- electrical power
- power (w) = voltage (v) x
- efficiency (%) = useful energy/total energy supplied
- sankey diagrams- show all energy transferred, useful and wasted
- saving energy
- reducing transfer- use less, cavity wall insulation, double glazing and water tank jackets
- cost effective- payback time = initial cost/ annual saving
- govt incentive
- electricity
- transported to homes through national grid
- non renewable- don't quickly regenerate after use, eg nuclear fuel and fossil fuels
- damage environment, will run out but still provides most of energy
- renewable- regenerate quickly and don't harm environment, can be unreliable
- solar, HEP, biofuels
- fossil fuels
- mining destroys environment, CO2 released, oil spills, sulfur dioxide produced (coil)
- cheap, effective and currently in use
- nuclear
- fission- splits atom of element, giving off heat, used in thermal generator
- adv- cheap, efficient, no CO2
- dis- radioactive waste, non-renewable, powerstation and disposal is costly
- irradiation- exposed without going into body, contamination- source into body
- renewable power
- wind power- own generator, on exposed land
- pros- no CO2,, cheap running, no permanent land damage
- cons- start up costs are high, not reliable, noisy and eye saw
- solar cells- directly generate current from sunlight
- pros- free energy, low running costs, no pollution, v-reliable in sunny places
- cons- expensive initial, not cost effective to connect to national grid
- wave power- air pushed in by wave, turns turbine
- pros- no pollution, free energy, renewable
- cons- un-reliable, disrupts wildlife
- tidal barrages- dams on estuaries, tide turns turbines
- pros- reliable,non polluting, low running costs
- cons- expensive start up, wildlife disruption, prevents river access
- biofuels- fuel gained from biological materials
- pros- carbon neutral
- geothermal- heat from mantle used in thermal power stations
- Pros- cheap, reliable, sustainable
- only suitable in some places eg. iceland
- hydro electricity- dams to create HEP
- pros- reliable, no fuel costs, low running costs
- cons- flood= land loss, less water downstream
- wind power- own generator, on exposed land
- comparing power- we need to look for sustainability and efficiency
- set up, running costs and decommissio-n
- generators- turning a magnet in a coil of wire, thus inducing a current
- larger current- more coils and faster movement
- step up- more turns in secondary coil vice versa for step down.
- national grid- transports electricity around the country to homes and buildings
- high voltage and low current to reduce energy loss
- electrical power
- energy- joules are a unit of energy
- energy transferred (j) = power (w) x time (s)
- or (kwh)= (kw) x (hr)
- P3- sustainable energy
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