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  • Power Factor (PF)
  • The ratio of true power to apparent power in an AC circuit. In power conversion technology, power factor is used in conjunction with describing the AC input current to the power supply.
  • Power failure
  • Total loss of utility power: Causes electrical equipment to stop working.
  • Pulse-width modulation (PWM)
  • A circuit used in switching regulated power supplies where the switching frequency is held constant and the width of the power pulse is varied, controlling both line and load changes with minimal dissipation.