BRAINCAKEMagnetism and electromagnetism
Revision notes for Magnetism and electromagnetism in AQA Physics (8463). Every lesson in BrainCake comes with R.E.C.I.P.E. recall steps, a quick check and spaced reviews.
- Poles of a magnetThe poles of a magnet are the places where the magnetic forces are strongest.
- Magnetic fieldsThe magnetic field is the region around a magnet where a force acts on another magnet or on a magnetic material.
- ElectromagnetismWhen a current flows through a wire, a magnetic field is produced around the wire.
- Fleming's left-hand rule (HT only)When a conductor carrying a current is placed in a magnetic field, the magnet producing the field and the conductor exert a force on each other.
- Electric motors (HT only)A coil of wire carrying a current in a magnetic field tends to rotate.
- Loudspeakers (physics only) (HT only)Loudspeakers and headphones use the motor effect to convert variations in current in electrical circuits into the pressure variations in sound waves.
- Induced potential (HT only)If a wire moves through a magnetic field so that it cuts the field lines, or if the magnetic field around a wire changes, a potential difference is…
- Uses of the generator effect (HT only)The generator effect is used to make electricity.
- Microphones (HT only)A microphone uses the generator effect to turn sound into an electrical signal.
- Transformers (HT only)A basic transformer has a primary coil and a secondary coil wound on an iron core.