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An alternator is a type of generator that's commonly used in vehicles, while generators can be used in a variety of applications. Both devices convert mechanical energy into electrical energy. [1, 2, 3]  


AlternatorGenerator
Current typeAlternating current (AC)AC or direct current (DC)
Magnetic fieldRotatingStationary or fixed
Armature movementStationaryRotating
EfficiencyMore efficientLess efficient
OutputHigher outputLower output

How they work [4, 5]  

Alternator 

A drive belt turns the alternator's rotor shaft, which spins magnets inside a coil to generate AC. [4, 5]

Generator 

A conductor is rotated within a magnetic field to create a voltage difference that generates electricity. [2]

Applications [2]  

  • Alternator: Used in vehicles to charge the battery and power electrical components. [2]
  • Generator: Used in portable units to power homes and other structures. [3]

Alternators are the preferred choice in most modern applications because of their efficiency and ability to produce higher currents. [2]


EDIT BY ME: Generators were used almost universally in WWII vehicles


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