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Induction
As you can see, the light
bulb flashes the moment you connect the switch to the battery.
The explanation is, that the magnetic field coming from the upper electromagnet
flows through the lower iron core.
The change in that magnetic field, in turn induces an electric
current in the lower coil.
You should note that the current in the lower coil ceases once the magnetic
field has stabilised.
If you switch off the current, you get another
flash, because the magnetic field disappears. The change in the field
induces another current in the lower core, and makes the light bulb flash
again.
In order to apply your knowledge of electromagnetism and induction,
you may now return to the page on
wind turbine generators.
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