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Electrical Principles and Units Flashcards

7 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 7 Electrical Principles and Units flashcards as text

  1. A resistor dissipates 50 watts with 10 volts across it. What is the current through the resistor?

    Answer: 5 A

    Using P = IV, rearranged as I = P/V = 50/10 = 5 A.

  2. Three resistors of 10 Ω, 20 Ω, and 30 Ω are connected in series. What is the total resistance?

    Answer: 60 Ω

    Series resistances add directly: 10 + 20 + 30 = 60 Ω.

  3. Two 100-ohm resistors are connected in parallel. What is the total resistance?

    Answer: 50 Ω

    For two equal parallel resistors, Rp = R/2 = 100/2 = 50 Ω.

  4. A 2 kΩ and 8 kΩ resistor are connected in series across 100 V as a voltage divider. What is the voltage across the 2 kΩ resistor?

    Answer: 20 V

    V = Vsupply × R1/(R1+R2) = 100 × 2000/10000 = 20 V.

  5. A 12 V supply is connected to a 4 Ω and a 6 Ω resistor in parallel. What is the total current from the supply?

    Answer: 5 A

    I1 = 12/4 = 3 A, I2 = 12/6 = 2 A; total current = 3 + 2 = 5 A.

  6. What is the power dissipated by a 470-ohm resistor carrying 20 mA?

    Answer: 188 mW

    P = I²R = (0.02)² × 470 = 0.0004 × 470 = 0.188 W = 188 mW.

  7. Resistors R1 = 100 Ω and R2 = 200 Ω are connected in series across a 12 V supply. What is the voltage drop across R1?

    Answer: 4 V

    V1 = 12 × 100/(100+200) = 12 × 1/3 = 4 V.