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DC Circuit Analysis with a Potentiometer

  1. Sep 17, 2013 #1
    I've been able to get all of the problems up to this point, but I have never seen a problem like this before, so here it goes:

    9. Below is shown a simple resistive current source. The resistive load is represented
    by a 10 kΩ potentiometer. What is the current through the resistive load over the
    full range of the potentiometer and what is the reading on the voltmeter over the
    full range of the potentiometer? Does this circuit represent a reasonable constant
    current source? Why or why not (explain)?

    Please see the following PDF (Question #9) for the diagram of the circuit:
    http://www.engr.colostate.edu/ECE103/FA13/homeworks/Homework2%20FA2013.pdf

    The only equations that I know that are useful here would probably just be Ohm's law and variants:
    P=IV
    V=IR
    I=dQ/dt

    Unfortunately, I don't know where to begin with this problem. The only true given is the voltage, so I don't know how to solve this problem.

    Any help is appreciated!
     
  2. jcsd
  3. Sep 17, 2013 #2

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    Subproblems:
    - what are current and voltage if the potentiometer is at the uppermost position?
    - what are current and voltage if the potentiometer is at the lowermost position?
    - what are current and voltage if the potentiometer is somewhere in between?

    You just need Ohm's law to solve that problem.
     
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