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Electrical Theory and Math Flashcards

6 cards from real Electrician 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 Math flashcards as text

  1. In a parallel circuit, what happens to total resistance as more resistors are added?

    Answer: It decreases

    Adding more resistors in parallel provides additional paths for current, reducing overall resistance.

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

    Answer: 60 Hz

    The US electrical grid operates at 60 Hz, meaning AC voltage completes 60 cycles per second.

  3. What is the RMS voltage of US standard household current if the peak voltage is approximately 170V?

    Answer: 120V

    RMS voltage equals peak voltage multiplied by 0.707, so 170 × 0.707 ≈ 120V.

  4. What is the impedance of a circuit with 8 ohms resistance and 6 ohms reactance?

    Answer: 10 ohms

    Impedance Z = √(R² + X²) = √(64 + 36) = √100 = 10 ohms.

  5. Which of the following best describes inductance in an electrical circuit?

    Answer: Opposition to change in current

    Inductance is the property of a conductor that opposes changes in current flow, measured in henries.

  6. What is the total power consumed by a 120V circuit with 10 amps at a power factor of 0.8?

    Answer: 960 watts

    True power P = V × I × PF = 120 × 10 × 0.8 = 960 watts.