P1b
- Created by: anniedarlington
- Created on: 27-03-15 16:36
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- P1b
- renewable energy
- solar cells = free energy source, no emissions // unreliable, high initial costs, not very efficient
- pumped storage
- at night big power stations make more than they need, spare elect. is used to pump water from reservoirs up to a higher level, water stores energy til needed, water allowed to flow downhill at peak times, powering turbines etc
- hydroelectric power
- no atmospheric pollution, building the dam is expensive, valleys has to be cut into, rare for reservoirs to dry out, renewable, not contribution to global warming, high initial costs, destructs habitats
- tidal barrage = tide comes in, water flows through turbines and builds up behind barrage,when tide goes out water is allowed out at a controlled speed through turbines
- reliable and uk has a long coastline
- wave power - wave moves water upwards, moving air makes turbine spin etc, water moves down, air sucked down and so on
- geothermal = volcanic areas, hot water and steam rise to surface which can drive turbines
- biofuels = renewable as new sources can always be made
- decommission = shutting down/ removing from active status
- nuclear = reliable, no greenhouse gases
- supply = amount generated and delivered, demand= amount needed by consumers
- high demand is a problem for the national grid
- build more plants, power output of plants increased
- high demand is a problem for the national grid
- refraction = the changing of direction of a wave when it hits the boundary of another medium
- light doesn't diffract around a doorway as the gap is too wide
- mobile phones used regardless of health risk for convenience and enjoyment
- camera = lens focuses light onto a light sensitive film
- delay before echo heard= echoed sound has to travel further
- Origin of universe
- universe started as a single point that exploded in a big bang and has been expanding ever since
- CMBR - low freq EM radiation coming from all parts of the universe
- big bang = high freq high energy radiation, became lower of both as the universe cooled
- renewable energy
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