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6.P.3A.4 Magnetism and Electricity

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by

Michele Bahm

on 10 November 2016

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Transcript of 6.P.3A.4 Magnetism and Electricity

Energy is awesome!
Magnetism
is the force of
attraction
or
repulsion
of magnetic materials.

Surrounding a magnet is a
magnetic
field that applies a force, a push or
pull
, without actually touching an object.
Evidence of a magnetic field can be found in how the field
affects
magnetic materials (including, but not limited to, a compass, iron filings, and paper clips).
An electric current flowing through a wire wrapped around an iron core forms a
magnet
.
Simple electric motors in action
Recall:
the properties of magnets include:

polarity
attraction
repulsion
strength
Examples of devices created by magnetism and electricity
Electromagnets:

An
electromagnet
is formed when wire in an electric circuit is wrapped around an
iron
core producing a magnetic field.


the magnet that results loses its magnetism if the electric current
stops
flowing
Magnetism and Electricity
Simple Electric Motor
like poles of the magnets repel and unlike poles of the magnet attract

this causes the coil to
rotate
and thus changes electrical energy to mechanical energy

this rotating coil of
wire
can be attached to a shaft and a blade in an electric fan
For your hard work you have earned 2:22 of cat awesomeness
Generators
a generator produces an electric current when a coil of wire wrapped around an iron core is
rotated
near a magnet

generators power plants produce electric energy for our homes

a generator contains coils of wire that are stationary, and rotating magnets are rotated by turbines.
Turbines
are huge wheels that rotate when pushed by water, wind, or steam.

Thus mechanical energy is changed to electrical energy by a generator. Smaller generators may be powered by
gasoline
Simple Electric Motors
an electric
motor
changes electrical energy to
mechanical
energy

it contains an
electromagnet
that rotates between the poles of a magnet

the coal of the electromagnet is connected to a battery or other
source
of electric current

when a electric current flows through the wire in the electromagnet, a magnetic field is
produced
in the coil


a coil of wire spinning around a magnet or a magnet spinning around a coil of wire can form an
electric
current
Full transcript