13

• 13.2 Recall the factors that affect the size and direction of an

  induced potential difference

  The size of the induced potential difference is determined by:

  The speed at which the wire, coil or magnet is moved.

  The number of turns on the coils of wire.

  The size of the coils.

  The strength of the magnetic field.
• 13.2 describe how the

  magnetic field produced opposes the original change

  As with all currents, the induced current creates a magnetic field around itself. Note that this magnetic field opposes the original change. For example, if a magnet is moved into a coil of wire, the induced magnetic field tends to repel the magnet back out of the coil.
• 13.5 Explain how an alternating current in one circuit can

  induce a current in another circuit in a transformer

  An alternating current creates a changing magnetic field, which cuts through the secondary coil, which induces a (alternating) current in the secondary coil.
• 13.6 Recall that a transformer can change the size of...

  an alternating voltage
• 14.1 Use a simple kinetic theory model to explain the different states

  of matter (solids, liquids and gases) in terms of the movement

  and arrangement of particles - liquid

  .They flow and take the shape of their container because the particles are free to move around each other

  .They cannot be compressed or squashed because the particles are close together and have no space to move into