Physics T1 - Renewable energy resources
- Created by: Claudiacumberpatch
- Created on: 11-03-20 20:39
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- Non-renewable energy
- Will never run out - energy can be 'renewed as it is used'
- Most damage environment but in less serious ways then non-renewable
- Don't provide much energy & some unreliable as depend on weather
- Bio-fuels
- Made from plant products/ animal dung, solid liquid or gas & burnt to produce electricity, run cars like fossil fuels
- Fairly reliable, crops take small time to grow & some crops grown all year round
- Can't respond to immediate energy demands so contunualy produced & stored for when needed
- Cost to refine very high
- Growing crops specifically, not enough space/water to meet demand of crops grown for food
- Forests cleared for space to grow crops, species lose natural habitat & burning of habitat increases methane & CO emissions
- Wind power- wind turbines
- Each has generator inside- wind rotates blades which turn generator & produces electricity
- No pollution
- Initial costs high
- Running costs minimal
- Lots needed to produce power, can spoil view & be noisy
- Unreliable- only work when windy so can't always supply electricity or respond to high demand
- Solar cells
- Made of materials that use energy transferred by light to create electrical current
- No pollution
- Initial costs high
- No running costs
- Generate electricity on small scales (e.g. power homes)
- Best in sunny countries, can work in cloudy countries
- Can't make at night or increase production when there's extra demand
- Hydro-electricity
- Flooding a valley by building big dam, rainwater caught & allowed out through turbines
- Immediately respond to increased electricity demand - more water let through turbines to generate more electricity
- Initial costs high
- Low running costs
- Reliable source
- Flooding of valley means loss of habitat for some species
- Tidal Barrages
- Big dams built across river estuaries (where river meets sea) with turbines in them
- As tide comes in fills up estuary, water let out through turbines at controlled speed to generate electricity
- No pollution
- Affect boat access
- Spoil views
- Pretty reliable (always happen twice a day)
- But height of tides variable & barrages don't work unless water level same wither side
- Initial costs high
- No fuel costs & minimal running costs
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