Power for the People Learning objectives: Know different ways of producing electricity Know different ways of producing electricity Understand the difference between renewable and non-renewable resources Understand the difference between renewable and non-renewable resources Decide how we can supply Cotterton with electricity Decide how we can supply Cotterton with electricity

Electricity

How can we produce electricity? Non-renewable: Non-renewable: Coal Coal Oil Oil Natural Gas Natural Gas Nuclear Power Nuclear Power Renewable: Solar Wind Hydroelectric Tidal Wave Biomass Geothermal

Non-renewable energy

Burning fossil fuels

Renewable energy

Wind power Sun heats certain areas Sun heats certain areas Creates pressure difference Creates pressure difference Produces wind Produces wind Wind turns blades Wind turns blades Turns turbine Turns turbine Produces electricity Produces electricity Simple – no need for steam Simple – no need for steam

AdvantagesDisadvantages Unreliable Few areas suitable Low power energy source Noisy and unsightly Renewable No acid rain No global warming Cheap to run once built Expensive to build Large area required Kills migratory birds Advantages and disadvantages

Wave power Wind over the sea – waves Wind over the sea – waves Used to turn a turbine Used to turn a turbine Very expensive set up Very expensive set up Low energy output Low energy output

Tidal power Gravity of moon Gravity of moon Pulls sea up and down Pulls sea up and down Used to turn a turbine Used to turn a turbine Non polluting, renewable and cheap to run Non polluting, renewable and cheap to run Expensive set up, low output Expensive set up, low output

More renewable energy

Solar power Photo- voltaic cells (photo = light voltaic= electricity) Photo- voltaic cells (photo = light voltaic= electricity) Light energy hits cell Light energy hits cell Knocks electron lose Knocks electron lose Flowing electrons = electricity Flowing electrons = electricity Solar heating cells Solar heating cells Turn water to steam – turbine Turn water to steam – turbine Heating water Heating water

AdvantagesDisadvantages Unreliable – why? Few areas suitable Low power energy source Toxic chemicals in solar cells can damage habitats Renewable No acid rain No global warming Cheap to run once built Expensive to build Advantages and disadvantages

Hydroelectricity

Cold water pumped down Warm water comes back up and used to turn turbines Water heated by hot rocks Advantages? Disadvantages? Renewable No acid rain or greenhouse effect Cheap once built Few areas suitable Expensive to build Geothermal

AdvantagesDisadvantages Destroys habitats Few areas suitable Unsightly Renewable No acid rain No global warming Cheap to run once built Expensive to build Large area required Some systems pump water back up at night with the surplus electricity – energy efficient. Pros and cons

Renewable energy in Cotterton

What does Cotterton need? 8000 inhabitants 8000 inhabitants 3000 people live in families (2 adults + 2 children) 3000 people live in families (2 adults + 2 children) 3500 Couples live together 3500 Couples live together 1500 Single people 1500 Single people Average electricity use Average electricity use Family = 5480 KWh per year Family = 5480 KWh per year Couple = 4117 KWh per year Couple = 4117 KWh per year Single person = 3084 KWh per year Single person = 3084 KWh per year 1 wind turbine produces KWh per year 1 wind turbine produces KWh per year

What do we know about energy resources? Get into 2 teams Get into 2 teams Get into 2 teams Get into 2 teams

Power for the People Learning outcomes: What are some of the different ways of producing electricity? What are some of the different ways of producing electricity? What’s the difference between renewable and non-renewable resources? What’s the difference between renewable and non-renewable resources? How can we supply Cotterton with electricity? How can we supply Cotterton with electricity?