A signal or power source that varies with time, switching polarities. Typically, sinusoidal and constant frequency. AC Power Supply: Power supply that delivers an AC voltage. A/D Conversion: Analog-To-Digital Conversion. The process of changing an analog signal into a digital value. Alternating Current: Electric current that rises to a maximum in one direction, falls back to zero, and then rises to a maximum in the opposite direction and then repeats. Ammeter: Instrument for measuring the current in amps, milliamps or microamps. Ampere or Amp: Ampere(s), the unit of electrical current. Current is defined as the amount of charge that flows past a give point, per unit of time. The symbol I is used for current in equations and A is the abbreviation for Ampere. Synonyms:
  • I
  • current
  • A