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Transformer is a device that increases or decreases the voltage of an alternating current.

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DC current is electric current that always is in one direction through a wire and the AC current is that reverses the direction is a regular pattern.

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Electromagnetic Induction

Generators

Visualizing motors and generators

Currents

Transformers

Transmiting Electrical Energy

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Electric current and magnetism

Electromagnetism

Electromagnets

Using electromagnets

Electric motors

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Magnetism

Magnetic Force

Magnetic Fields

Magnetic Lines

Magnetic Poles

Magnetic Materials

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Electromagnetic induction is the production of an electric current by charging magnetic field.
Generator is object that uses electromagnetic induction to transform mechanical energy into electrical energy.