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Electrical Principles and Units Flashcards

6 cards from real GROL 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 Principles and Units flashcards as text

  1. In a direct current (DC) circuit, what is the relationship between voltage, current, and resistance as described by Ohm's Law?

    Answer: Voltage is directly proportional to the current and resistance.

    Ohm's Law states that the voltage (E) across a conductor is directly proportional to the current (I) flowing through it, provided all physical conditions and temperatures remain the same. The constant of proportionality is the resistance (R). The formula is E = I * R.

  2. A technician measures a voltage of 24 volts across a resistor with a current of 2 amperes flowing through it. What is the resistance of the component?

    Answer: 12 ohms

    According to Ohm's Law, Resistance (R) = Voltage (E) / Current (I). Given E = 24V and I = 2A, the calculation is R = 24V / 2A = 12 ohms.

  3. Which of the following is the standard unit of measurement for electrical power?

    Answer: Watt

    The standard unit for electrical power is the Watt (W). Power is the rate at which electrical energy is transferred by an electric circuit. It is calculated as Power (P) = Voltage (E) * Current (I).

  4. If three resistors of 10 ohms, 20 ohms, and 30 ohms are connected in a series circuit, what is the total resistance?

    Answer: 60 ohms

    When resistors are connected in series, the total resistance is the sum of the individual resistances. Therefore, R_total = R1 + R2 + R3 = 10Ω + 20Ω + 30Ω = 60Ω.

  5. What is the total resistance of a circuit with two resistors, 100 ohms and 100 ohms, connected in parallel?

    Answer: 50 ohms

    For resistors in parallel, the reciprocal of the total resistance is the sum of the reciprocals of the individual resistances (1/R_total = 1/R1 + 1/R2). For two equal resistors, the total resistance is half the value of one resistor. So, R_total = 100Ω / 2 = 50Ω.

  6. Which of the following best defines electric current?

    Answer: The flow of electrons in an electric circuit.

    Electric current (measured in amperes) is defined as the rate of flow of electric charge, which is typically carried by moving electrons in a conductor like a wire.