Electromagnetism: Induction and Motors
Magnets and coils make electricity and turn things
1:02 · 720p · With AI narration and captions. This sample was made with the same system as this service.
Narration (full text)
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Induction and Motors
Generators that make electricity and motors that turn things both work using magnets and coils.
Electromagnetic Induction
Bringing a magnet closer changes the magnetic field through the coil, creating a voltage that drives a current. This is electromagnetic induction.
Direction of the Current
When you pull the magnet out, the current reverses. In other words, the current flows in a direction that opposes the change in the magnetic field.
Speed and Voltage
The faster you move the magnet, the faster the field changes, and the bigger the voltage.
The Generator
A generator makes electricity by keeping a coil spinning in a magnetic field.
The Motor
A motor works the other way around. When current flows through a coil in a magnetic field, a force acts on it and it turns.
The Commutator
The commutator flips the current every half turn, so the coil keeps turning the same way.
Linking Motion and Electricity
A generator turns motion into electricity, and a motor turns electricity into motion.
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