Physics
A dynamo is a device which

Creates electrical energy
Converts mechanical energy into electrical energy
Converts electrical energy into mechanical energy
Creates mechanical energy

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Physics
A dynamo is used to convert

Magnetic energy into mechanical energy
Electrical energy into mechanical energy
Mechanical energy into electrical energy
Electrical energy into magnetic energy

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Physics
Dynamo is a device for converting

Mechanical energy into electrical energy
Magnetic energy into electrical energy
Chemical energy into electrical energy
Heat energy into electrical energy

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