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Electromagnetic Induction

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Electromagnetic Induction the basis of motors and generators Electric Current in a Magnetic Field Current in a wire produces a force in a magnetic field. – PowerPoint PPT presentation

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Title: Electromagnetic Induction


1
Electromagnetic Induction
  • the basis of motors and generators

2
Electric Current in a Magnetic Field
  • Current in a wire produces a force in a magnetic
    field.
  • The force is perpendicular to both the direction
    of the current and the direction of the field.
  • Technology produces motors and meters.
  • Direction of current must be changed to get
    rotational motion.

3
Convert magnetism into electricity
  • Oersted showed that a current produces a magnetic
    field
  • Changing the placement of a conducting wire in a
    magnetic field produces current

4
called Electromagnetic Induction
5
Producing voltage
  • moving a coil of wire in a magnetic field
    produces voltage and current.
  • movements of the diaphragm of a microphone will
    move wires in a magnetic field producing slight
    current that can be amplified.

6
Electric Generator
  • move coil in a magnetic field
  • amount and direction of current changes
  • results in alternating current

7
AC Current
8
Interactions between electricity and magnetism
  • Changing magnetic field produces an electric
    current.
  • The electric current produces a magnetic field.
  • The two fields react.
  • Used to make an induction motor for amusement
    park rides and star wars weapons. Also used to
    make an electric guitar.

9
Transformers
  • increases or decreases AC voltage
  • based on induction
  • insulated current-carrying wire coiled on one
    side of iron ring (primary)
  • second wire coiled on other side of iron ring
    (secondary)

10
Faradays Law
  • The induced voltage in a coil is proportional to
    the product of the number of loops and the rate
    at which the magnetic field changes within those
    loops.

11
Math of Transformers
  • secondary voltage turns on secondary
  • ------------------------- ---------------------p
    rimary voltage turns on primary
  • Vs/Vp Ns/Np
  • Vp Ip Vs Is (ideal transformer power is
    conserved)
  • Is/Ip Vp/Vs Np/Ns

12
(No Transcript)
13
Why AC won the battle of the current
  • Thomas Edison wanted the US electrical system to
    be DC.
  • Tesla thought AC would be better.
  • AC won
  • AC can make motor and generators easier
  • Easy to change voltage
  • transmit at high voltage, use at low voltage
  • but Edison became richer and better known.
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