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Electrical and Electronic Knowledge Flashcards

6 cards from real IST practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 Electrical and Electronic Knowledge flashcards as text

  1. What does AC stand for in electrical systems?

    Answer: Alternating Current

    AC stands for Alternating Current, which periodically reverses direction, unlike Direct Current (DC).

  2. What is the standard frequency of AC power in the United States?

    Answer: 60 Hz

    The US power grid operates at 60 Hz, meaning the current alternates direction 60 times per second.

  3. What is the function of a transformer in an electrical system?

    Answer: Change voltage levels from one level to another

    Transformers step AC voltage up or down to different levels using electromagnetic induction.

  4. A motor nameplate shows 480V/3-phase. What does '3-phase' indicate?

    Answer: The motor uses three separate AC waveforms offset by 120 degrees

    Three-phase power uses three AC waveforms that are each offset by 120 degrees, providing more efficient power delivery for industrial motors.

  5. If two 10-Ohm resistors are connected in parallel, what is the total resistance?

    Answer: 5 Ohms

    For two equal resistors in parallel, total resistance = R/2 = 10/2 = 5 Ohms.

  6. What instrument is used to measure electrical voltage?

    Answer: Voltmeter

    A voltmeter measures the electrical potential difference (voltage) between two points in a circuit.

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