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# Motor and generators

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### Motor and generators

1. 1. Agenda Bell Work• Pass in Watts it allabout• Review for Quiz• Circuit and Power Quiz• Notes: Electric Motorsand Generators• Practice WS• Building a DC motor
2. 2. Electric Motors andGeneratorsMay 8, 2013
3. 3. ►Electrical current can be generated bymoving a metal wire through amagnetic field►the wire must be part of an electricalcircuit, there is no electrical currentproduced with a wire with open ends►This applies both to alternatingcurrent (AC) and direct current (DC)electricity
4. 4. Electrical Generators/Motors►rotate a coil of wires through amagnetic field►AC generator uses slip rings to transferthe current to the electrical circuit►DC generator uses a split-ringcommutator
5. 5. AC vs. DC
6. 6. Electrical Motors►Uses an rotating electromagnet to convertelectrical energy into mechanical energy
7. 7. Electric MotorMElectricalEnergyMechanicalEnergyDC Motor
8. 8. How does it work?►The magnetic field around the wire causes itto be moved by the magnet (pushed orpulled)►Commutator is attached so when the polesof the electromagnet meet the permanentmagnet, the coil keeps turning
9. 9. Model Electric MotorBeakman MotorWhat do you need?1. Electric Energy2. Coil3. Magnetic Field
10. 10. Electric Generator►Use electromagnetic induction to convertmechanical energy into electrical energy
11. 11. Electric GeneratorGMechanicalEnergyElectricalEnergyStationary magnets - rotating magnets - electromagnets
12. 12. How it works►Mechanical energy turns to coil between apermanent magnet►Moving wire through a magnetic fieldcreates an electric current