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Homework Help: Voltage or Current Source?

  1. Jan 25, 2016 #1
    1. The problem statement, all variables and given/known data
    Check picture

    2. Relevant equations

    3. The attempt at a solution
    I thought I had this right, but then I started thinking about it and I'm not sure anymore. My thought was since the voltage was changing and the current was constant, that the source was a voltage source. I kinda thought of it as you changing the voltage on a power supply or something keeping the current constant. Is that right? I feel like it's not.
    New Doc 6_1.jpg
  2. jcsd
  3. Jan 25, 2016 #2


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    Staff: Mentor

    Ideal independent supplies are generally specified to produce a single fixed value. A voltage supply produces a fixed voltage, while a current supply produces a fixed current. Variable power supplies are not the same thing, being more a version of a controlled source with other bells and whistles for convenience and safety.

    An ideal voltage supply will produce a given fixed voltage no matter what. It will produce any amount of current required in order to accomplish this.

    An ideal current supply will produce a given fixed current no matter what. It will produce any amount of voltage required in order to accomplish this.
  4. Jan 25, 2016 #3
    Hmm. Ok. Thanks for clarifying!
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