Physics
The first law of thermodynamics is simply the case of

Charle's law
The law of heat exchange
Newton's law of cooling
The law of conservation of energy

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Physics
Dynamo is a device for converting

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

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Physics
Negative feedback in amplifiers

Decreases bandwidth and decreases noise
Increases bandwidth and decreases noise
Decreases bandwidth and increases noise
Increases bandwidth and increases noise

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