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Power and Energy

Power and Energy. Generating. Electricity. So Where Do We Get the Electricity We Need?. Cells aka Batteries. Outlets and Power lines. Types of Electric Current. Direct Current (DC) Type of electricity produced by a battery. Electrons in a circuit travel in only one direction.

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Power and Energy

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  1. Power and Energy

  2. Generating Electricity

  3. So Where Do We Get the Electricity We Need? Cells aka Batteries Outlets and Power lines

  4. Types of Electric Current • Direct Current (DC) • Type of electricity produced by a battery. • Electrons in a circuit travel in only one direction. • Alternating Current (AC) • Type of electricity used in the home. • Produced by power generating plants. • Electrons move back and forth.

  5. Transformers • Can convert AC to DC current. • Can convert Voltage and Current • High Voltage & Low Current  Low Voltage & High Current • Low Voltage & High Current  High Voltage & Low Current

  6. Electric Current Generation

  7. How Does Electricity Get Generated? At the generation station a turbine spins a magnet surrounded by metal wire coils

  8. How Does Electricity Get Generated Magnetic field causes electrons to move in wire

  9. So now you know how it’s made, what problem are we faced with to generate the electricity? ?

  10. You need an energy source!

  11. There are 2 categories of energy sources: Renewable Non- renewable • Cannot be reused shortly • after use • Requires millions of • years to produce fuel • Supply is limited • regenerated • Can be reused in a short period of time after use • Supply can be easily • regenerated

  12. Non-Renewable Sources • Fossil Fuels: (e.g. Coal, oil, and gas) store energy. This energy is released when fossil fuels are burned. Burning these provide the energy to run generators, which produce electricity. • Nuclear Fuels: also provide the energy to run generators. 37% of Ontario’s electricity is made this way.

  13. Renewable Energy Sources • Wind can be used to generate electricity. The windmill at the CNE generates enough electricity to power 200 homes. • Rivers are a constant supply of energy. Moving water turns turbines which generate electricity. • The Sun is the source of all energy on Earth. Photoelectric (solar) cells convert sunlight energy into electricity.

  14. Power • Electrical Power is a measure of how quickly electrical energy can be used by a load or generated by a source. • Electrical Power (P) is measured in the unit of Watts (W) • A 100W light bulb uses more power than a 60W light bulb • A 100W light bulb is brighter than a 60W light bulb

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