Magnets and Electromagnets

Mind Map by lillycherriman, updated more than 1 year ago
Created by lillycherriman over 6 years ago


This is a year 9 physics topic summary mind map on: Magnets and Electromagnets.

Resource summary

Magnets and Electromagnets
  1. Definition
    1. Magnets create a magnetic force between one another and between themselves and magnetic materials.
    2. Magnetism
      1. Magnets can attract and repel one another. They also attract magnetic materials.
        1. Magnetic materials are attracted to magnets but not to each other. Examples of magnetic materials are; iron, steel and nickel.
          1. Non-magnetic materials are not affected at all by magnets.
            1. The magnetic force passes through non-magnetic materials but not through magnetic materials.
              1. The ends of magnets are called poles. The south-seeking pole points south and the north seeking pole points north.
                1. 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.
                2. Magnetic Field
                  1. The area around magnets is called the magnetic field. Magnetic field lines can be plotted with a compass.
                    1. The direction of the magnetic field goes from the magnet's north pole to its south pole.
                      1. Stronger magnets are represented by showing more lines of force around them.
                        1. The Earth behaves as if it had a giant magnet inside it.
                          1. The magnet in a compass lines up with the Earth's magnetic field.
                          2. Own magnet
                            1. You can make your own magnet by stroking an iron nail with one end of a magnet.
                            2. Electromagnet
                              1. When an electric current flows through a wire, the wire behaves like a weak magnet.
                                1. Magnets made using electricity are called electromagnets. These contain a core, usually of iron, and a coil of wire which carries an electric current.
                                  1. Electromagnets are very useful because they can be switched on and off.
                                    1. 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.
                                    2. Relays
                                      1. Relay switches use the current from one circuit to switch on the current in another circuit.
                                        1. A relay switch has an electromagnet in one circuit next to an iron switch in the other circuit.
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