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Transcript of Electromagnetic induction
How can you increase the strength of a motor?
Explain how to indice a current in a wire.
How can you increase the strength of the induced current?
When a current flows through a wire a magnetic field is produced around the wire.
The motor effect and its use.
The size of the force can be increased by increasing the strength of the magnetic field or increasing the size of the current.
The conductor will not experience a force if it is parallel to the magnetic field.
The direction of the force is reversed if either the direction of the current or the direction of the magnetic field is reversed.
Explain that a current in a conductor produces a magnetic field and that this is the basis for electromagnets, applications of which include their use on cranes for lifting iron or steel.
Explain the principle of the motor effect and know how to use Fleming’s Left-hand Rule to identify the direction of the force produced.
Describe how the size and direction of the force produced can be altered.
If an electrical conductor ‘cuts’ through a magnetic field a potential difference is induced across the ends of the conductor.
If a magnet is moved into a coil of wire a potential difference is induced across the ends of the coil.
Switch mode transformers
Switch mode transformers operate at a high frequency, often between 50 and 200 kHz.
Switch mode transformers are much lighter and smaller than traditional transformers working from a 50Hz mains supply.
Switch mode transformers use very little power when they are switched on but no load is applied