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Pregunta 172

Which of the following describes alternating current?

  1. Current that alternates between a positive direction and zero
  2. Current that alternates between a negative direction and zero
  3. Current that alternates between positive and negative directionsRespuesta correcta
  4. All these answers are correct

Explicación

Alternating current periodically reverses direction, flowing first one way through the circuit and then the other. A current that only varies between one polarity and zero is pulsating direct current, which is why the first two choices do not describe AC.

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Pregunta 172: Which of the following describes alternating current? · FCC Technician Class (Element 2) · Questena