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ELECTRICAL WIRING. Electrical Terms and Theory To accompany the Georgia Agriculture Curriculum Course: AG-AMI-01.421 Agricultural Mechanics I Unit 3: Electrical Wiring 2010. VGP. The Atom. The Basic Structure of an Atom. Atoms will have the same number of Electrons in the

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ELECTRICAL WIRING


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    1. ELECTRICAL WIRING Electrical Terms and Theory To accompany the Georgia Agriculture Curriculum Course: AG-AMI-01.421 Agricultural Mechanics I Unit 3: Electrical Wiring 2010 VGP

    2. The Atom

    3. The Basic Structure of an Atom Atoms will have the same number of Electrons in the orbit as there are Protons in the center. Electrons (29 total) Valence Ring (Outer Ring) Protons (29 total) A Copper Atom

    4. Balanced Atom Equal Number of Protons and Electrons

    5. - - - + + + - Unbalanced Atom Number of Protons and Electrons is Unequal

    6. Circuit

    7. - - - + + + + + + - Positive Charged Atom Negative Charged Atom - - Too Few Electrons Too Many Electrons

    8. 1 2 3 Materials with Electrons in their outer rings make good conductors Because the Electrons are easily dislodged from their orbit and pushed to the atom next to them. (Electron flow)

    9. Materials which hold their electrons closely are good Insulators Electrons are not easily dislodged from their orbit and pushed to the atom next to them.

    10. + + + + + + + + + + + + Electrons flow from atom to atom - - - - - - - - - - - - - - - - - - - - - - - - -

    11. Parallel vs. Series Circuits

    12. Electrical Circuit vs. Water

    13. Amperes “AMP” What is an Ampere or (Amp)? • A unit of measure of the rate of flow of electricity. “Currrent” •One Amp = 6,280,000,000,000,000,000 (6.28 Quintillion electrons passing a point in one second.) •Symbol: A or I

    14. Ammeter

    15. Voltage “Volts” What is a Volt? •An Electromotive Force. •A unit of measure of electrical pressure •The force required to move one amp of electricity through a resistance of one ohm. •Symbol: E or V •Voltages Available: 120 and 240

    16. Voltmeter

    17. Resistance “Ohm” What is an Ohm? •A measure of the resistance of electrons to flow in a material. •The resistance to the movement of electrons. •Relates to four Factors –Material, Diameter, Length, and Temperature. •Symbol: R or O

    18. Ohmmeter

    19. Wattage “Watts” • What is a Watt? • • A unit of measure of electrical power • • A calculated quantity of electrical energy. • W = V x A • A kilowatt is 1000 watts. • A megawatt is 1,000,000 watts.

    20. Wattmeter

    21. Horsepower HP You can change horsepower to watts rather easily by figuring 1,000 watts for each horsepowerof motor rating

    22. Kilowatt-Hour Kwh A kilowatt-hour is the unit of measure by which electric power is marketed. Kilowatts x Hours = Kilowatt-Hours

    23. Types of Current • DC – direct current • AC- alternating current

    24. DC Current flows in one direction only. Used in flashlights, cameras, boats, automobiles

    25. AC Current flows in one direction ½ of the cycle then reverses for the 2nd ½ of the cycle. Used in most home appliances, t.v., radio, computers.

    26. AC/DC Current Figure 1-B-29. (a) DC current always flows in one direction, unchanging, as through this automotive headlight bulb. (b) AC current flows in one direction for one-half cycle, then reverses direction for one-half cycle, completing a cycle. This action occurs 60 times per second. (60 HZ)

    27. Hertz A hertz is an international measure of electrical frequency, with 1 Hz being one cycle per second. Electrical outlets have different frequencies in different countries. For instance, while outlets in the United States, Canada and Aruba have frequencies of 60 Hz, outlets in China and Denmark are 50 Hz.

    28. Types of Power • Single phase 60- cycles per minute • Three phase 180 cycles per minute

    29. Single Phase Three Wire Service The Current Alternates Directions 60 Cycles Per Second Supplies 120 and 240 Volts

    30. Single Phase Electricity

    31. Three Phase Four Wire Service The Current Alternates Direction 180 Cycles Per Second. Functions at Higher Voltages

    32. Three Phase Electricity

    33. Types of Power

    34. Sources • Our power is generated for us compliments of our natural resources • Renewable and Non-renewable

    35. Renewable Resources • Solar Energy • Tidal Energy • Geothermal Energy • Solid Wastes Energy • Water Energy • And Possibly Fast Growing Woods

    36. Non-renewable Resources • Fossil fuels • Coal • Oil • Natural Gas • Non-sustainable Woods • Nuclear (uranium)

    37. How are these resources converted to usable means? • Some type of mechanical generator!

    38. Water Power Hydroelectric Generation- Accounts for approximately 11% of the U.S power supply

    39. Steam Power • Fossil fuels • Nuclear Fission • Geothermal • Solid Waste • Wood There are several sources of steam power:

    40. Fossil Fuels Coal, Oil, & Natural Gas

    41. Coal Accounts for about 51% of steam power generated electricity Decreasing in quality Increasing in pollutants

    42. Oil Accounts for 2% of electricity generated. Once preferred over coal for ease of handling and for how clean it burned In lesser supply now so is a less desirable source

    43. Natural Gas Accounts for about 15% of electricity generated Quickly becoming the fuel of choice.

    44. Reasons that natural gas is preferred • Use of existing technology • Low capital cost • Short license procedures • Ability to add small amounts of distributed generation for growth needs without building huge expensive plants • Efficiency and cost effectiveness • Lower environmental impacts

    45. NuclearFission Non-renewable Source Splitting uranium atoms produces a great deal of heat energy that is processed into electrical energy in nuclear plants.

    46. Nuclear Generator