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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. A 120V circuit has a resistance of 40 ohms. What is the power dissipated?

    Answer: 360 W

    Power = V²/R = 120²/40 = 14400/40 = 360 W.

  2. Which material is considered the best conductor of electricity?

    Answer: Silver

    Silver has the highest electrical conductivity of all metals, though copper is more commonly used due to cost.

  3. In a parallel circuit with three 60-ohm resistors, what is the total resistance?

    Answer: 20 Ω

    For equal resistors in parallel, total resistance = R/n = 60/3 = 20 Ω.

  4. What happens to current flow when temperature increases in a copper conductor?

    Answer: Current decreases

    As temperature rises, resistance of copper increases, which reduces current flow for a given voltage.

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

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

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

  6. What is the unit of electrical charge?

    Answer: Coulomb

    The coulomb (C) is the SI unit of electric charge; one ampere equals one coulomb per second.

  7. A capacitor in a DC circuit, once fully charged, acts as:

    Answer: An open circuit

    A fully charged capacitor blocks DC current flow, behaving like an open circuit in steady state.