Electromagnetic Induction
- Created by: Jasmin
- Created on: 15-05-13 14:15
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- Electromagnetic Induction
- Creation of a pd across a conductor which is experiencing a change in magnetic field
- Moving a magnet in a coil of wire induces a voltage
- Cuts the magnetic field lines
- If move magnet in opposite direction pd/current reversed too
- If polarity of magnet reversed pd/current reversed too
- Generator
- As turn magnet, magnetic field through coil changes - change in field induces pd which can make current flow in wire
- When magnet tuned half turn, direction of mf through coil reverses, pd reverses so current flows in opp direction
- Keep turning magnet same direction, pd keep reversing every half turn - AC
- Dynamos use electromagnetic induction to generate current
- Used on bikes to power lights
- Cog wheel at top position so touches one of wheels
- As wheel moves turns cog which is attached to magnet - AC
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