Download Electric and magnetic forces in everyday life

Electric and Magnetic Forces in
Everyday Life
In this presentation you will:
 identify electric and magnetic forces in
everyday life
Monday, April 8, 13
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Introduction
Many devices used in everyday life rely on electric
and magnetic forces to operate.
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Monday, April 8, 13
Electric Force Examples
Some examples of electric force include:
 Abrasive paper manufacturing
– the positively charged
particles used to smooth
rough surfaces are attracted
to a negatively charged
adhesive paper.
 Electroplating and anodizing –
metals coated with an oxide
layer for protection by way of
an attractive force caused by
electrical current flow.
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Monday, April 8, 13
Electric Force Examples
 Powder coating – a
coating of charged
powder particles are
attracted to an
oppositely charged
object.
 Party trick – ‘sticky
balloon’. Rubbing a
balloon against your
hair will create enough
static charge to make
the balloon ‘stick’ to a
wall.
Monday, April 8, 13
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Magnetic Force Examples
There is a natural
magnetic field
surrounding us all the
time; the Earth’s
magnetic field.
A compass detects the
Earth’s magnetic field.
A needle is moved by
the magnetic force, so
that one end points
north and the other end
points south.
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Monday, April 8, 13
Magnetic Force Examples
There are numerous applications of electric and
magnetic forces.
A door catch is a simple device that uses the
magnetic force of attraction to hold a door closed.
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Monday, April 8, 13
Magnetic Force Examples
More complex applications include: televisions,
radios, microwave ovens, telephone systems, and
computers.
Computer hard drives use
magnetism to store the
data on a rotating disk.
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Monday, April 8, 13
Magnetic Force Examples
An industrial application of
magnetic force is an
electromagnetic crane that is
used for lifting metal objects.
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Monday, April 8, 13
Magnetic Force Examples
There are applications of
magnetic force in medical
science. X-ray and
scanning devices rely on
electromagnetic action.
MRI scanners are Magnetic
Resonance Imaging
devices, and they are used
in hospitals to create 3D
images of body parts.
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Monday, April 8, 13
Magnetic Force Examples
Electric motors use the
electromagnetic force between a
magnet and a current carrying
coil to produce movement.
Electric generators use the
electromagnetic force
between a magnet and a
moving coil to generate
electrical energy.
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Monday, April 8, 13
Magnetic Force Examples
Loudspeakers use an
electric current flowing
through a coil to generate
a magnetic field. This field
interacts with the field of
a permanent magnet to
make a diaphragm move
and produce sound.
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Monday, April 8, 13
Question 1
Would the abrasive paper manufacturing process
work if both the paper and the particles were
positively charged?
Answer Yes or No.
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Monday, April 8, 13
Question 1
Would the abrasive paper manufacturing process
work if both the paper and the particles were
positively charged?
Answer Yes or No.
No
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Monday, April 8, 13
Question 2
What creates a mechanical turning force in an
electric motor?
A) A single magnetic field
B) Two magnetic fields
C) Microwaves, generated by an electro-magnetic
device
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Monday, April 8, 13
Question 2
What creates a mechanical turning force in an
electric motor?
A) A single magnetic field
B) Two magnetic fields
C) Microwaves, generated by an electro-magnetic
device
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Monday, April 8, 13
Summary
In this presentation you have seen:
 examples of electric and magnetic forces in
everyday life
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Monday, April 8, 13