fields

=Fields=
 * Gravitational force and field
 * See circular motion !!!!!!!!!!!
 * Electric charge – electrostatics?
 * Van der graaff generator
 * With fluorescent tube – can also light tube from PLASMA (a state of matter – charged gas? …..?) ball and where you hold tube determines how much it will light!
 * Bubbles will be repelled
 * Cupcake cases laid on top will fly off one by one
 * Rods and rubbers
 * Crumbs in bowl
 * Photocopiers
 * Paint sprayers
 * Conductors and insulators
 * Electrical conductors
 * Graphite
 * All metals
 * Electrical insulators
 * Plastics
 * Polythene
 * Nylon
 * Acetate
 * Rubber
 * Dry wood
 * Glass
 * Ceramics
 * Electric force, potential and fields
 * Coulomb’s law
 * Electric field lines
 * **__Capacitors?__**
 * Bin bag capacitor – see: []
 * Magnetic force and fields
 * Magnetic materials
 * Only cobalt, iron and nickel and their compounds are magnetic???!!!
 * Magnetic field lines
 * Making a compass – stroke a nail (steel or iron) with neodinium or ceramic magnets and place on a large flat cork in a tray of water – should align with earth’s poles
 * Right – hand curl rule
 * Can build up a bride of iron filings by adding amounts to each pole of a large magnet
 * Due to currents
 * Compasses around single core wire (within circuit)
 * Magnetic force on a current (moving charge)
 * Making D.C. motors
 * Single core wire (in a circuit) in a strong magnetic field
 * Jumping ring
 * Fleming’s left hand rule
 * Jumping ring
 * Fleming’s left hand rule

=Electromagnetic induction – a.c. and dynamo appears in too many places=
 * Induced electromotive force (induced emf)
 * Dynamo
 * Michael Faraday
 * Lenz’s law
 * Alternating Current – see a.c. in current topic
 * A.C. generator (a motor connected to a D.C. supply will turn; replace D.C. supply with an oscilloscope and manually turn the coils, will produce an A.C. – see dynamo above)
 * dynamo
 * Transformers
 * Power losses in transmission (less power lost at high voltage – power lines)
 * Power lines demonstration
 * Show that uses A.C., in primary coil to produce a changing magnetic field through the core that induces a current (that will be A.C.) in secondary coil
 * Eddy currents & electromagnetic breaking
 * Swinging aluminium vane
 * Effects of changing aluminium thickness vs. breaking force (I.B. project: air track with runner mounting aluminium vane that moves through a strong magnetic field (horse shoe magnet)– light gates both ends of the magnet measure change in speed of runner.
 * Lamination of cores in transformers