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  • Question

  • If four 90 Ω resistors are connected in series across an 18 V source, the current equals ___.


  • Options
  • A. 50 mA
  • B. 0.2 A
  • C. 5 A
  • D. 20 A

  • Correct Answer
  • 50 mA 

    Explanation 
    By Ohm's law, V = IR.

I = V/R

Given, Four 90 ohm resisters in series. 

So, R = ( R1 + R2 + R3 + R4) = 4 x 90 = 360 ohms.

Therefore, I = 18/360 = 0.05 A [or] 50 milli amps.

    • More questions

    • 1. 

      In the given circuit, what will the voltage be across R3 25 µs after the switch is moved to position 2?


    • Options
    • A. 2.88 V
    • B. 5.9 V
    • C. 8.34 V
    • D. 14 V
      • Discuss
    • 2. 

      The reflected resistance is ___ as seen by the source in the given circu.


    • Options
    • A. 150 Ω
    • B. 300 Ω
    • C. 600 Ω
    • D. 2.4 kΩ
      • Discuss
    • 3. The unit designator for resistance value is the:

    • Options
    • A. ampere
    • B. ohm
    • C. volt
    • D. watt
      • Discuss
    • 4. A(n) ___ has a conductive channel only when it is biased properly.

    • Options
    • A. p-channel JFET
    • B. n-channel D-MOSFET
    • C. p-channel D-MOSFET
    • D. n-channel E-MOSFET
      • Discuss
    • 5. The difference between analog voltage represented by two adjacent digital codes, or the analog step size, is the:

    • Options
    • A. quantization
    • B. accuracy
    • C. resolution
    • D. monotonicity
      • Discuss
    • 6. A "U" shaped, opposite-polarity material built near a JFET-channel center is called the:

    • Options
    • A. gate
    • B. block
    • C. drain
    • D. heat sink
      • Discuss
    • 7. Which test equipment best allows a comparison between input and output signals?

    • Options
    • A. an oscilloscope
    • B. a logic probe
    • C. a spectrum analyzer
    • D. a multitrace oscilloscope
      • Discuss
    • 8. When multiplying in binary the decimal values 13 × 11, what is the third partial product?

    • Options
    • A. 100000
    • B. 100001
    • C. 0000
    • D. 1011
      • Discuss
    • 9. A voltage-follower op-amp has the output connected directly to the inverting input.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. 

      The average value of the output voltage from the circuit in the given circuit equals ___.


    • Options
    • A. 5.48 V
    • B. 2.74 V
    • C. 0 V
    • D. 6.37 V
      • Discuss

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