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Difference between Alternator and Generator. By Yuvi - Study Point

Hey everyone, today we are going to see the simple difference between Alternator and Generator.
So, without wasting any time lets get started.

  • Alternator 
  1. An alternator is a machine that converts mechanical energy from a prime mover into the A.C electrical power at a specific frequency and voltage.
  2. Alternator induces an alternating current.
  3. The input supply in the alternator is taken from the stator. 
  4. The alternator has a variable output e.m.f.
  5. The alternator is smaller in size as compared to the generator and that's why it requires less space as compared to the generator.
  6. The output of the alternator is higher than the generator.
  7. The alternator has a wide range of rotation per minute (RPM).
  8. The armature of an alternator is stationary which means in an alternator, electricity is produced when the magnetic field spins inside the stator (winding of wire).   
  9. The alternator has a rotating magnetic field.
  10. A dead battery is can't be charged by an alternator and if we try to charge it then there is a possibility that it will burn out.
  • Generator
  1. The generator can convert mechanical energy from the prime mover into A.C or D.C electrical power.
  2. Alternating current can be produced by an alternator and this alternating current is converted into direct current with the help of commutator.
  3. The input is taken from the rotor in the generator.
  4. The generator's output voltage is constant.
  5. The generator's size is greater than the alternator and hence it requires large space as compared to the alternator.
  6. The generator's output is low as compared to the alternator.
  7. The generator has a narrow range of RPM (rotation per minute).
  8. In the generator, the armature is rotating which means the winding of the wire in a generator spins inside a fixed magnetic field to generate electricity. 
  9. The generator has a stationary magnetic field.
  10. The generator can be used for charging a dead battery.


  • { Please go and check out my channel and this video so that you can easily understand the comparison or the difference between Alternator and Generator. }

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