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  • Question

  • In a certain three-branch parallel circuit, R1 has 12 mA through it, R2 has 15 mA through it, and R3 has 25 mA through it. After measuring a total of 27 mA, you can say that


  • Options
  • A. R3 is open
  • B. R1 is open
  • C. R2 is open
  • D. the circuit is operating properly

  • Correct Answer
  • R3 is open 

    • Parallel Circuits problems

    Search Results

    • 1. If there are a total of 120 mA into a parallel circuit consisting of three branches, and two of the branch currents are 40 mA and 10 mA, the third branch current is

    • Options
    • A. 50 mA
    • B. 70 mA
    • C. 120 mA
    • D. 40 mA
      • Discuss
    • 2. Six resistors are in parallel. The two lowest-value resistors are both 1.2 kΩ. The total resistance

    • Options
    • A. is less than 6 kΩ
    • B. is greater than 1.2 kΩ
    • C. is less than 1.2 kΩ
    • D. is less than 600 Ω
      • Discuss
    • 3. Five light bulbs are connected in parallel across 110 V. Each bulb is rated at 200 W. The current through each bulb is approximately

    • Options
    • A. 2.2 A
    • B. 137 mA
    • C. 1.8 A
    • D. 9.09 A
      • Discuss
    • 4. The currents into a junction flow along two paths. One current is 4 A and the other is 3 A. The total current out of the junction is

    • Options
    • A. 1 A
    • B. 7 A
    • C. unknown
    • D. the larger of the two
      • Discuss
    • 5. When a 1.6 kΩ resistor and a 120 Ω resistor are connected in parallel, the total resistance is

    • Options
    • A. greater than 1.6 kΩ
    • B. greater than 120 Ω but less than 1.6 kΩ
    • C. less than 120 Ω but greater than 100 Ω
    • D. less than 100 Ω
      • Discuss
    • 6. The following currents are measured in the same direction in a three-branch parallel circuit: 200 mA, 340 mA, and 700 mA. The value of the current into the junction of these branches is

    • Options
    • A. 200 mA
    • B. 540 mA
    • C. 1.24 A
    • D. 900 mA
      • Discuss
    • 7. Find the total current through R3 in the given circuit.


    • Options
    • A. 7.3 mA
    • B. 5.5 mA
    • C. 12.8 mA
    • D. 1.8 mA
      • Discuss
    • 8. Referring to circuit given, if R1 is changed to a 68 Ω resistor, what will be the current through it?


    • Options
    • A. 0.16 A
    • B. 0.24 A
    • C. 0.2 A
    • D. 0.04 A
      • Discuss
    • 9. Find the current through R2 of the given circuit.


    • Options
    • A. 30.7 mA
    • B. 104 mA
    • C. 74 mA
    • D. 134 mA
      • Discuss
    • 10. A 470 Ω RL is connected across a voltage source, VS, of 120 V. The source's internal resistance, RS, is 12 Ω. What is the output voltage across the load?

    • Options
    • A. 120 V
    • B. 0 V
    • C. 117 V
    • D. 12 V
      • Discuss

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