The document discusses electric motors and generators. It explains that moving a metal wire through a magnetic field can generate electrical current. Both AC and DC electricity can be produced this way. Electric motors convert electrical energy into mechanical motion by using an electromagnet rotating within a magnetic field, while generators convert mechanical energy into electrical energy using the same principle in reverse. The key components of motors and generators are coils, magnetic fields, and commutators or slip rings to regulate current flow.

1. Agenda Bell Work
• Pass in Watts it all
about
• Review for Quiz
• Circuit and Power Quiz
• Notes: Electric Motors
and Generators
• Practice WS
• Building a DC motor

2. Electric Motors and
Generators
May 8, 2013

3. ►Electrical current can be generated by
moving a metal wire through a
magnetic field
►the wire must be part of an electrical
circuit, there is no electrical current
produced with a wire with open ends
►This applies both to alternating
current (AC) and direct current (DC)
electricity

4. Electrical Generators/Motors
►rotate a coil of wires through a
magnetic field
►AC generator uses slip rings to transfer
the current to the electrical circuit
►DC generator uses a split-ring
commutator

5. AC vs. DC

6. Electrical Motors
►Uses an rotating electromagnet to convert
electrical energy into mechanical energy

7. Electric Motor
M
Electrical
Energy
Mechanical
Energy
DC Motor

8. How does it work?
►The magnetic field around the wire causes it
to be moved by the magnet (pushed or
pulled)
►Commutator is attached so when the poles
of the electromagnet meet the permanent
magnet, the coil keeps turning

10. Model Electric Motor
Beakman Motor
What do you need?
1. Electric Energy
2. Coil
3. Magnetic Field

11. Electric Generator
►Use electromagnetic induction to convert
mechanical energy into electrical energy

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

13. How it works
►Mechanical energy turns to coil between a
permanent magnet
►Moving wire through a magnetic field
creates an electric current