Circuit analysis

Discussion in 'Homework Help' started by Cerkit, Jan 19, 2009.

  1. Cerkit

    Thread Starter Active Member

    Jan 4, 2009
    275
    3
    Hi. How can I find the value of R in the box circuit with components as shown below?

     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Just measure it with a multimeter between nodes 1 and 2. Or apply a voltage between nodes 1 and 2, measure the current flowing and then calculate the resistance using Ohm's law.
     
  3. Cerkit

    Thread Starter Active Member

    Jan 4, 2009
    275
    3
    The circuit is in a box so can not access it. Also the ground is fixed can not apply voltage between n1 and n2....??
     
  4. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Apply a voltage at node 1 and measure the current out of node 2.
     
  5. Cerkit

    Thread Starter Active Member

    Jan 4, 2009
    275
    3
    Will the capacitor not affect my readings or will it be negligable?
     
  6. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    The losses due to the leakage resistance of the capacitor will be negligible. If you want you can put a resistor in series with node 1 to avoid an inrush current into the capacitor when you first apply the DC voltage. However, this will complicate calculations a little bit.
     
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