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Homework Help: CRO display (involve D.C and A.C)

  1. Nov 16, 2012 #1
    1. The problem statement, all variables and given/known data


    So my question is, why isn't D a correct answer?

    And also, what will happen to the voltage and ampere, if I connect a A.C. and D.C. parallel?

    2. Relevant equations

    3. The attempt at a solution
    Last edited: Nov 16, 2012
  2. jcsd
  3. Nov 16, 2012 #2


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    Staff: Mentor

    Both voltage sources will insist on forcing the result to be equal to their own values. The resulting "struggle" between them will make them want to produce very large currents indeed; if they are ideal sources the currents would be infinite!. One or both of the sources or the connecting wires between them must fail (zzzzZZT! BANG!). Not so good :eek:
    Last edited: Nov 16, 2012
  4. Nov 16, 2012 #3
    Alright, thank you very much ! :)
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