8493090
Description
Mind Map by Mansee Jain, updated more than 1 year ago
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Created by lillycherriman
almost 10 years ago
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Copied by Mansee Jain
about 8 years ago
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Magnets and Electromagnets
Revision Notes
- Definition
- Definition of Magnetism:
Magnetism is a non - contact force
between magnets
- A Permanent Magnet is a magnet which keep their
magnetisim for a long period of time
- Uses: Credit Cards, Fridge Door,
Phone Case and Micro - Phones
- Uses: Credit Cards, Fridge Door,
Phone Case and Micro - Phones
- A Permanent Magnet is a magnet which keep their
magnetisim for a long period of time
- Definition of Magnetism:
Magnetism is a non - contact force
between magnets
- Magnetism
- Magnets can attract and repel one another. They also attract magnetic
materials.
- Magnetic materials are attracted to magnets but not to each
other. Examples of magnetic materials are; iron, steel and nickel.
- Non-magnetic materials are not affected at all by
magnets.
- The magnetic force passes
through non-magnetic materials
but not through magnetic
materials.
- The ends of magnets are
called poles. The
south-seeking pole points
south and the north seeking
pole points north.
- A north-seeking pole and
a south-seeking pole
attract each other, but two
south-seeking poles or
two north-seeking poles
repel each other.
- Magnets can attract and repel one another. They also attract magnetic
materials.
- Magnetic
Field
- The area around magnets is called the magnetic field. Magnetic field lines can be plotted with
a compass.
- The direction of the magnetic field goes from the magnet's north pole to its south
pole.
- Stronger magnets are represented by showing more lines of force around
them.
- The Earth behaves as if it
had a giant magnet inside it.
- The
magnet in a
compass
lines up
with the
Earth's
magnetic
field.
- The area around magnets is called the magnetic field. Magnetic field lines can be plotted with
a compass.
- Own
magnet
- You can make your own magnet by stroking an iron nail with one end of a
magnet.
- You can make your own magnet by stroking an iron nail with one end of a
magnet.
- Electromagnet
- When an electric current flows through a wire, the wire behaves like a weak
magnet.
- Magnets made using electricity are called electromagnets. These contain a
core, usually of iron, and a coil of wire which carries an electric current.
- Electromagnets are very useful because they can be switched on and
off.
- You can change the strength of an electromagnet by changing the size of
the current, coiling the wire or placing a piece of iron inside the coil of wire.
- Definition: A current in a wire which produces a magnetic
field
- When an electric current flows through a wire, the wire behaves like a weak
magnet.
- Relays
- Relay switches use the
current from one circuit to
switch on the current in
another circuit.
- A relay switch has an
electromagnet in one
circuit next to an iron
switch in the other circuit.
- Relay switches use the
current from one circuit to
switch on the current in
another circuit.
- Motors
- Electric Energy = Kinetic
Energy
- Electric Energy = Kinetic
Energy
- Generators
- Kinetic Energy ( From Turbine ) = Electrical
Energy
- Kinetic Energy ( From Turbine ) = Electrical
Energy
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