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# Generators Physics watch

1. When the magnet is turning the magnetic field through the coil changes, but what does this mean???? I dont understand how a generator works and in what way does the magnetic field change????????

What does it mean when the direction of the magnetic field through the coil reverses? Why would it reverse and what is the point of that??
3. Spinning around It is not practical to generate large amounts of electricity by passing a magnet in and out of a coil of wire. Instead, generators induce a current by spinning a coil of wire inside a magnetic field, or by spinning a magnet inside a coil of wire. As this happens, a potential difference is produced between the ends of the coil, which causes a current to flow. One simple example of a generator is the bicycle dynamo. The dynamo has a wheel that touches the back tyre. As the bicycle moves, the wheel turns a magnet inside a coil. This induces enough electricity to run the bicycle's lights.

From bitesize
4. (Original post by Roosheene)
Spinning around It is not practical to generate large amounts of electricity by passing a magnet in and out of a coil of wire. Instead, generators induce a current by spinning a coil of wire inside a magnetic field, or by spinning a magnet inside a coil of wire. As this happens, a potential difference is produced between the ends of the coil, which causes a current to flow. One simple example of a generator is the bicycle dynamo. The dynamo has a wheel that touches the back tyre. As the bicycle moves, the wheel turns a magnet inside a coil. This induces enough electricity to run the bicycle's lights.

From bitesize
Yes but what does it mean by the magnetic field changing? And why is this important in order to produce a voltage? I know it was to be alternating otherwise the voltage cant be made but why

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