Practice Test Geeks(PC) Professional Electrical Contractor Practice Test
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Electrical Theory & Principles Flashcards

7 cards from real PC 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 & Principles flashcards as text

  1. Three resistors of 6Ω, 12Ω, and 4Ω are connected in parallel. What is the total equivalent resistance?

    Answer: 2Ω

    1/Rt = 1/6 + 1/12 + 1/4 = 2/12 + 1/12 + 3/12 = 6/12; Rt = 2Ω.

  2. In a parallel circuit, which quantity remains the same across all branches?

    Answer: Voltage

    Voltage is identical across all branches in a parallel circuit.

  3. Kirchhoff's Current Law (KCL) states that:

    Answer: The sum of currents entering a node equals the sum leaving it

    KCL states that the algebraic sum of all currents at any node equals zero — what enters must leave.

  4. A capacitor in a DC circuit, after fully charging, acts like a(n):

    Answer: Open circuit

    A fully charged capacitor blocks DC current, effectively acting as an open circuit.

  5. Capacitance is measured in which unit?

    Answer: Farad (F)

    Capacitance is measured in Farads (F), with practical values often in microfarads (µF) or picofarads (pF).

  6. When capacitors are connected in series, the total capacitance compared to the smallest individual capacitor is:

    Answer: Less

    Series capacitors reduce total capacitance below the smallest individual value, opposite to resistors in series.

  7. An inductor opposes changes in which electrical quantity?

    Answer: Current

    Inductors oppose changes in current by generating a back-EMF proportional to the rate of current change.