This video is a summary of all of AQA Magnetism and Electromagnetism, explained for GCSE Physics 9-1. You can use this as an AQA Magnetism and Electromagnetism revision tool.
The magnetic field around a permanent magnet loops from the north end to the south end and can be represented using field lines. If the field is stronger then the field lines are closer together. The magnetic field around a current-carrying wire is circular and we use the right-hand thumb rule to determine its direction. A solenoid acts like a bar magnet.
The motor effect: A current flowing in a magnetic field will produce movement. We use Fleming's left hand rule to determine the direction of movement. Thumb = force/movement, first finger = magnetic field and second finger = current.
The generator effect: A moving wire in a magnetic field will produce an electric current. This is very similar to the motor effect and again, we use Fleming's left hand rule. There are two types of generator: an alternator (AC) and a dynamo (DC)
The force of a magnetic field is given by: force = magnetic field strength x current x length of wire, F = BIl.
Transformers are used to step up or step down the potential difference of the National Grid. Vp/Vs = np/ns and Vp x Ip = Vs x Is.
Thanks for watching,
Lewis
Relevant for GCSE Physics 9-1 in the following exam boards:
AQA (including Trilogy)
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