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. A series circuit has resistors of 10Ω, 20Ω, and 30Ω connected to a 120V source. What is the total current in the circuit?

    Answer: 2A

    Total resistance = 10+20+30 = 60Ω; I = V/R = 120/60 = 2A.

  2. Which of the following best describes the relationship between power, voltage, and current in a DC circuit?

    Answer: P = V × I

    Power (watts) equals voltage (volts) multiplied by current (amperes): P = V × I.

  3. In a series circuit, if one resistor increases in value, the total current will:

    Answer: Decrease

    Higher resistance in a series circuit increases total resistance, reducing current per Ohm's Law.

  4. A 1,500W electric heater is connected to a 120V circuit. What is the operating current?

    Answer: 12.5A

    I = P/V = 1,500/120 = 12.5A.

  5. Kirchhoff's Voltage Law (KVL) states that the algebraic sum of all voltages around any closed loop is:

    Answer: Zero

    KVL states that the sum of all voltage rises and drops around any closed loop must equal zero.

  6. What is the resistance of a conductor if 5A flows through it when 25V is applied?

    Answer: 5Ω

    R = V/I = 25/5 = 5Ω.

  7. Which statement about voltage drops in a series circuit is correct?

    Answer: Voltage drops are proportional to resistance values

    In a series circuit, voltage drops are proportional to each resistor's value relative to total resistance.