Electricity Generation-
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Transcript of Electricity Generation-
Electricity Generation-energy & power
Today we will learn …
•What is energy? •What is power?
•What is electricity?
•How is electricity generated?
What is Energy ? … What is Power ???
Energy is what makes things happen!•Electricity is a very useful type of energy that we use every day to make things happen.
Power is (basically) how fast energy is used.•We can use energy quickly, or we can use it more slowly.
Energy & Power.
• Energy is what makes things happen. Measured in Joules (or Calories).
• Law of Energy (energy can neither be created or destroyed, it can only be transformed).
• Power is how much energy is transformed in 1 second. Measured in Joules per second, Watts or kilo-Watts.
• Electricity industry measures and charges for energy in kilowatt hours (kWh).
Example
Toaster:• Power rating = 2 kW• Time on = ¼ hour• Energy used = 2 x ¼ = 0.5 kWh
Light bulb:• Power rating = 100 W = 0.100 kW• Time on = 5 hour• Energy used = 0.1 x 5 = 0.5 kWh
Electricity is … a type of energy
Where does our Electricity come from in NZ?
NZ Energy Generation 2010
Geothermal, 12.8%
Gas, 21.2%
Coal, 4.5%
Wind , 3.7%
Other*, 1.4%
Hydro, 56.4%
How is Electricity Generated?
- Types of Power Station -
Hydro (spilling excess water)
Hydro
Hydro (pipes dropping down to turbines)
Francis turbine (right) and inlet scroll (left)
Turbine spins a generator
Hydro (Pelton turbine)
Pelton turbine and generator
Make your own Pelton Turbine - Generator
Wind
Enercon E126 wind turbine: •Tower 135m, •Blades 126m diameter, •Power output 7MW.
Thermal (Fossil fuels)
Geo-thermal
Solar Farm
Solar (Photo-voltaic)