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When an alternator is running on no-load the power supplied by the prime mover of an alternator goes to

  • When an alternator is running on no-load the power supplied by the prime mover of an alternator goes to Meet no-load losses.
  • The no-load losses in an alternator include various components such as core losses, windage losses, and bearing losses, which collectively represent the power dissipated in the alternator when there is no electrical load connected to the output terminals.
  • Since there is no electrical load connected to the output terminals of the alternator when it is running on no load, the power supplied by the prime mover is not converted into electrical power, and instead, it is dissipated as heat in the various components of the alternator.
  • Therefore, the power supplied by the prime mover is primarily used to overcome the no-load losses in the alternator when it is running on no-load.
  • As the electrical load on the alternator is increased, the power supplied by the prime mover must increase to meet the additional electrical load requirements in addition to overcoming the no-load losses.