electric power distribution generators and motors n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Electric Power Distribution, Generators and Motors PowerPoint Presentation
Download Presentation
Electric Power Distribution, Generators and Motors

Loading in 2 Seconds...

play fullscreen
1 / 31

Electric Power Distribution, Generators and Motors - PowerPoint PPT Presentation


  • 293 Views
  • Uploaded on

Electric Power Distribution, Generators and Motors. Benchmark Companies Inc PO Box 473768 Aurora CO 80047. Electric Power Distribution,. New ideas for today Magnetic induction Lenz’s law Transformers and power transmission Motors and Generators. Observations about Power Distribution.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

Electric Power Distribution, Generators and Motors


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
    Presentation Transcript
    1. Electric Power Distribution, Generators and Motors Benchmark Companies Inc PO Box 473768 Aurora CO 80047

    2. Electric Power Distribution,

    3. New ideas for today • Magnetic induction • Lenz’s law • Transformers and power transmission • Motors and Generators

    4. Observations about Power Distribution Household power is AC (alternating current) Power comes in voltages like 120V & 240V

    5. Observations about Power Distribution Power is transmitted at “high voltage” like 500KV

    6. Observations about Power Distribution Power transformers are visible everywhere

    7. Observations about Power Distribution Power substations are visible on occasion

    8. Power Consumption in wires • Reminder: power consumption = current x voltage dropIxV voltage drop = resistance x current IxR power consumption= resistance x current2 I2xR • Impact of the calculation: Wires waste power as heat Doubling current quadruples wasted power

    9. Power Consumption in wires • Example: Resistance of 1 mile of power line is 10 Ohms. • Determine the voltage drop across the power line if 200 Amps is transmitted at 240 Volts to power one typical house. The Power consumed across 1 mile is I2xR = 200A2x10 = 400KW is needed before we can begin to deliver power to a typical house.

    10. DC AC Edison Tesla Westinghouse

    11. DC= “direct current” AC=“alternating current” DC vs AC a visual approach DC can supply power . So can AC For transmission AC is superior

    12. DC= “direct current” AC = alternating current Let’s explore why…… AC=“alternating current” Rotation Amplitude Amplitude/Time

    13. AC = alternating current As a conductor is rotated within a magnetic field alternating current is produced in that conductor Rotation within a magnetic field Amplitude Current Amplitude vs. time 0o 90o 180o 270o 360o 90o 0o 180o Positive Amplitude P N Negative Amplitude 360o 270o Time

    14. Power Transmission • For efficient power transmission: • Use low-resistance wires (thick, short copper) • Use low current and high voltage drop • Can accomplish this with AC (alternating current) power transmission.

    15. Click for Bar Magnet And Pick-up coil example

    16. Electromagnetic Induction Changing magnetic field produces an electric field

    17. Electromagnetic Induction Current in a conductor produces a magnetic field

    18. Electromagnetic Induction An Induced magnetic field opposes the original magnetic field change (Lenz’s law)

    19. Lenz’s Law

    20. Electromagnet Transformer Example

    21. Transformer • Alternating current in one circuit induces an alternating current in a second circuit • Transfers power between the two circuits • Doesn’t transfer charge between the two circuits

    22. Transformer on fire

    23. Transformers • Power arriving in the primary circuit must equal power leaving the secondary circuit • Power = current x voltage • A transformer can change the voltage and current while keeping the power unchanged!

    24. Step Down Transformer • Fewer turns in secondary circuit so charge is pushed a shorter distance • Smaller voltage rise • A larger current at low voltage flows in thesecondary circuit

    25. Step Up Transformer • More turns in secondary circuit so charge is pushed a longer distance • Larger voltage rise • A smaller current at high voltage flows in the secondary circuit

    26. Observations about Electric Generators and Motors • A generator provides electric power • A generator requires a mechanical power • A motor provides mechanical power • A motor requires electric power Alternator

    27. Click me

    28. Electric Generator Rotating magnet • makes changing magnetic field • induces AC current in the loop Converts mechanical power into electrical power

    29. Electric Motor Input AC power • AC current makes changing magnetic field • causes magnet to turn Converts electrical power into mechanical power A motor is a generator run backwards !

    30. End of Presentation