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Electrical Theory & Fundamentals Flashcards

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

Read the first 7 Electrical Theory & Fundamentals flashcards as text

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

    Answer: 60 Hz

    The US power grid operates at 60 Hz, meaning AC current completes 60 cycles per second.

  2. Two resistors of 10 Ω and 15 Ω are connected in series across 50 V. What is the voltage across the 10 Ω resistor?

    Answer: 20 V

    Total R = 25 Ω, I = 50/25 = 2 A, V10 = 2 × 10 = 20 V.

  3. The opposition to current flow offered by a capacitor is called:

    Answer: Capacitive reactance

    Capacitive reactance (Xc) is the opposition capacitors present to AC current, measured in ohms.

  4. If a circuit draws 15 A at 240 V, what is the power consumption in kilowatts?

    Answer: 3.6 kW

    P = V × I = 240 × 15 = 3,600 W = 3.6 kW.

  5. Which law states that the induced EMF in a conductor is proportional to the rate of change of magnetic flux?

    Answer: Faraday's Law

    Faraday's Law states EMF = -dΦ/dt, meaning induced voltage equals the rate of change of magnetic flux.

  6. What is the peak voltage of a 120 V RMS AC supply?

    Answer: 169.7 V

    Peak voltage = RMS × √2 = 120 × 1.414 ≈ 169.7 V.

  7. What does a higher AWG number indicate about a wire?

    Answer: Smaller diameter and lower current capacity

    In the American Wire Gauge system, higher numbers indicate thinner wire with lower current-carrying capacity.