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Energy Resources And Power Plants
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- 2. ENERGY RESOURCES ANDPOWER PLANTS
- 3. Electric currents andmagnetic fields An electric current produces a magnetic field
- 4. Electric Circuits Anelectric circuit has a source of electrical energy. Circuits have devices run by electrical energy. Circuits are connected by conducting wires.
- 5. Parallel circuits Ina parallel circuit there are several paths for the current to take.
- 6. Electromagnets An electromagnetis a strong magnet that can be turned on and off.
- 7. Static Electricity Oppositecharges attract Like charges repel
- 8. Lightning-Static Discharge Lightningis an example of static discharge. During thunderstorms, air swirls violently. Water droplets within the clouds become electrically charged. Electrons collect in the lower parts of the cloud. Electrons move from areas of negative charge to areas of positive charge. As the electrons jump, they produce a spark. The spark is lightning.
- 9. Fuses A fuseis a device that contains a thin metal strip that will melt if there is too much current flowing through it.
- 10. Circuit Breakers Acircuit breaker is a safety device that uses and electromagnet to shut off the circuit when the current gets too high. Just Pull back the switch to reset the breaker.
- 11. Electric Motors Whena current carrying coil of wire is placed in a magnetic field, electrical energy is converted into mechanical energy. An electric motor is a device that uses an electric current to turn an axle.
- 12. Generator Anelectric generator converts mechanical energy into electrical energy. (Energy is never created, nor destroyed, but converted from one form to another).
- 13. Turbines A turbineis a circular device made up of many blades. The turbine is like a propeller. The turbine turns the generator that converts mechanical energy to electrical energy.
- 14. Electric power canbe produced in several ways. Each kind of generating power converts a particular kind of energy into electrical energy.
- 15. Energy is storedin the nucleus of the atom. When the nucleus is split, the energy that is released is used to heat water. The water turns into steam, which expands and turns a turbine.
- 16. Solar Energy-The sun’srays can be focused on a tower by large mirrors to boil water. The resulting steam then turns the turbine.
- 17. Geothermal Energy- Ina few locations on Earth, the underground water near the molten rock is heated until it becomes steam. This steam, which can be obtained through steam vents or drilling, is then used to turn the turbine.
- 18. Energy from fallingwater- Hydroelectric plant near the bases of dams or waterfalls use water to turn the turbines.
- 19. Tidal Energy-As thetide moves in and out in a basin behind a dam, the moving water can be used to turn the turbine.
- 20. Energy from fossilfuels-Coal, oil, and natural gas can be burned in generating plants to produce steam. The steam pushes against the blades of the turbine, causing it to turn.
- 21. Energy from wind-A windmill is essentially a turbine. As the wind blows, it turns the blades of the windmill, which then turn the generator.
- 22. The Energy generatedgoes from the generating power plant…
- 23. To the stepup transformers (increase voltage)…
- 24. To the highvoltage transmission lines….
- 25. To the stepdown transformers at the sub-stations…
- 26. To the stepdown transformers (decrease voltage) on poles, or on the ground …
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- 28. Paying for Electricity The total amount of energy used by an appliance is the power consumption multiplied by the time the appliance is used.
- 29. Thomas Edison openedhis first generating power plant in 1882.