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Electronics Flashcards

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

Read the first 7 Electronics flashcards as text

  1. A transformer has a primary winding of 500 turns and a secondary winding of 100 turns. If the primary voltage is 120V, what is the secondary voltage?

    Answer: 24V

    The turns ratio (500:100 = 5:1) means the secondary voltage is 120V ÷ 5 = 24V.

  2. Which type of capacitor is polarized and must be connected with correct polarity in a circuit?

    Answer: Electrolytic

    Electrolytic capacitors are polarized due to their construction and will be damaged if connected in reverse polarity.

  3. What is the function of a diode in an AC circuit when used as a half-wave rectifier?

    Answer: Allows current to flow in only one direction

    A diode passes current in only one direction, so it blocks the negative half-cycle of AC, producing pulsating DC.

  4. In a series RLC circuit at resonance, which statement is TRUE?

    Answer: Impedance is at minimum and equals R

    At resonance, XL equals XC and they cancel, leaving only resistance R as the total impedance.

  5. What does a multimeter measure when set to the 'ohms' setting?

    Answer: Resistance

    The ohms setting measures electrical resistance; the meter applies a small voltage and measures the resulting current to calculate resistance.

  6. Which component is commonly used to regulate voltage in a power supply by maintaining a constant output voltage despite load changes?

    Answer: Zener diode

    A zener diode is designed to operate in reverse breakdown at a specific voltage, making it ideal for voltage regulation.

  7. A circuit draws 3 amps from a 12V battery. What is the power consumed?

    Answer: 36 watts

    Power (P) = Voltage (V) × Current (I) = 12V × 3A = 36 watts.