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Power Electricity Costs Fossil Fuels
Coal (highest start up time), oil and gas (shortest
Power (W)= energy (J) Measured in kilowatt-hours (kWh) the cost per unit also
start up time). Disadvantages
needs to be known.
time (s) -Carbon dioxide produced ­global warming
Energy used (kWh) = power (kW) x time (hours) -Sulphur dioxide produced (acid rain)
Power is the rate at which
Take care with units! -Non renewable
energy is transferred.
1 watt means 1 joule of
energy is transferred every Wind
Chemical reactions involving uranium and
second. Advantages ­ no Greenhouse gases produced,
plutonium release heat which is used to
renewable, no fuel costs
boil water in power stations.
Disadvantages ­ noise and visual pollution, won't
Advantages ­ no Greenhouse gases
always work
Disadvantages ­ non renewable,
hazardous waste produced
which must be dealt with.
Cold water is heated using rocks within the
Earth, the resulting steam is used to drive
Water (tidal, wave & hydroelectric) turbines.
The movement of water is used to drive Advantages ­ renewable, no fuel costs, no
turbines. harmful gases
Advantages ­ no Greenhouse gases Disadvantages ­ very few suitable sites.
produced, renewable, hydroelectric and
Electricity and The National Grid tidal are reliable
1- Fuel is burnt to heat water to make steam Disadvantages ­ can only be used in
certain locations, loss of habitats and Dark colours absorb more heat.
2- The steam is used to spin a turbine
farmland. Light colours reflect more heat
3-The spinning turbine spins a generator which produces
4- The electricity goes to transformers to produce the Solar
correct voltage Solar cells convert light into electricity.
Step up transformers increase the voltage, step down Solar panels are used to heat water
transformers reduce voltage. The National Grid carries Advantages ­ renewable, no fuel costs,
energy at a low current as this means less energy is lost as no harmful gases produced
heat, but it requires a high voltage. Extra Notes
Disadvantages ­ expensive and
inefficient, need a sunny climate, won't
work at night.…read more


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