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Electrical Theory and Principles Flashcards

6 cards from real IEC 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 Theory and Principles flashcards as text

  1. An AC circuit contains a resistor, an inductor, and a capacitor. What is the total opposition to the flow of alternating current called?

    Answer: Impedance

    Impedance (Z) is the total opposition to current flow in an AC circuit. It is the complex sum of resistance (R) and reactance (X), which includes inductive reactance (XL) and capacitive reactance (XC).

  2. A simple circuit has a voltage of 120V and a resistance of 10 ohms. According to Ohm's Law, what is the current flowing through the circuit?

    Answer: 12 Amperes

    Ohm's Law states that Current (I) = Voltage (V) / Resistance (R). Therefore, I = 120V / 10Ω, which equals 12A.

  3. A standard 120V AC outlet in the United States provides a voltage that is typically specified as its RMS value. What does the RMS (Root Mean Square) value represent?

    Answer: The equivalent DC voltage that would produce the same heating effect.

    The RMS value of an AC voltage is its effective value. It represents the equivalent DC voltage that would deliver the same amount of power to a resistor, resulting in the same heating effect.

  4. An electrician is running two copper conductors of the same length to a load. Conductor A has a cross-sectional area of 10.4 mm², and Conductor B has a cross-sectional area of 5.2 mm². Which of the following statements is true?

    Answer: Conductor B has twice the resistance of Conductor A.

    The resistance of a conductor is inversely proportional to its cross-sectional area. Since Conductor B has half the cross-sectional area of Conductor A, it will have twice the resistance over the same length.

  5. In a parallel circuit containing three resistors of 10Ω, 20Ω, and 40Ω, what can be said about the total resistance of the circuit?

    Answer: It is less than the smallest individual resistance (10Ω).

    A key characteristic of a parallel circuit is that the total resistance is always less than the value of the smallest resistor in the circuit. The formula is 1/R_total = 1/R1 + 1/R2 + 1/R3...

  6. A motor is operating on a 240V circuit and is drawing a current of 5A. What is the power consumed by the motor?

    Answer: 1200 Watts

    The formula for electrical power (P) is the product of voltage (V) and current (I), expressed as P = V x I. In this scenario, P = 240V x 5A = 1200 Watts.