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How do we get Electricity

How do we get Electricity. How do we get Electricity. What is Electricity?. Electricity is energy transported by the motion of electrons. **We do not make electricity, we CONVERT other energy sources into electrical energy**. Conversion is the name of the game. Alternating Current

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How do we get Electricity

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  1. How do we get Electricity

  2. How do we get Electricity

  3. What is Electricity? Electricity is energy transported by the motion of electrons **We do not make electricity, we CONVERT other energy sources into electrical energy** Conversion is the name of the game

  4. Alternating Current Large-scale generators produce AC Follows sine wave with n cycles per second 1, 2, 3-phase? US:120 V,60 Hz Malaysia: 240 V,50Hz Transforming ability Direct Current Batteries, Photovoltaics, fuel cells, small DC generators Charge in ONE direction Negative, Positive terminals Easy conversion AC to DC, not DC to AC AC DC

  5. Faraday Effect •  Basic Concepts • Voltage – V – Potential to Move Charge (volts) • Current – I – Charge Movement (amperes or amps) • Resistance – R – V = IxR (R in =ohms) • Power – P = IxV = I2xR (watts) Faraday Effect

  6. Electric Motor M Electrical Energy Mechanical Energy DC Motor

  7. Model Electric Motor Electric Energy Coil Magnetic Field What do you need?

  8. Flemming’s Left Hand Rule (Motor Rule) • Use: To determine the direction of a force on a current carrying conductor in a magnetic field

  9. The carbon rod is NOT magnetic. • When no current flows, the rod is stationary • When we turn on the current, the rod experiences a force that makes it move. • The direction of the force is determined by Fleming' Left Hand Rule

  10. Next slide looks down the shaft Basic Theory B I I w shaft h

  11. B Basic Theory Current coming toward you Shaft Current leaving away from you

  12. B F F T = 2hFcos = 2hIwBNcos Basic Theory direction by right-hand rule Thumb = current Forefinger = B Rest = Force

  13. B Basic Theory

  14. B Basic Theory

  15. B Basic Theory

  16. B Basic Theory

  17. B Basic Theory

  18. B Basic Theory

  19. B Basic Theory

  20. B Basic Theory

  21. B Basic Theory

  22. DC Motor

  23. Electric Generator G Mechanical Energy Electrical Energy Stationary magnets - rotating magnets - electromagnets

  24. Fleming’s Right hand rule (Generator Rule) • Use: To determine the direction of the induced emf/current of a conductor moving in a magnetic field.

  25. Electromechanical Energy Conversion Motor MechanicalEnergy ElectricalEnergy Generator DEMO

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