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kirchoffs law

Discussion in 'Electronic Basics' started by Sunil, Jan 2, 2007.

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  1. Sunil

    Sunil Guest

    hello...my name is sunil. I am currently doing my first year
    Electronics and communication engineering in chennai. We had electric
    circuits lab the other day and our prof told us that we had to perform
    an experiment to verify kirchoff's theorems (both of them). Though i
    know the theory, i am unable to imagine an experiment. The prof also
    told us that we had to do this experiment on a breadboard. Can someone
    help me??
     
  2. Mikkel Lund

    Mikkel Lund Guest

    Sunil skrev:
    Then you don't know it ;-) Imagine a voltage reference and a number of
    resistors in series.
    If no, see:
    http://phoenix.phys.clemson.edu/labs/223/ohmslaw/index.html
     
  3. Kirchoff's voltage law says that the sum of all voltages
    around a loop must add up to zero. Connect some resistors
    in series around a loop that includes a voltage source (a 9
    volt battery, perhaps), measure the voltage across each
    resistor and the source, keeping careful track of the
    polarity relative to the direction you go around the loop,
    and add them up and see how close to zero they total.

    Kirchoff's current law says that the sum of all currents
    entering a single node add up to zero. So you arrange for
    some currents to arrive at a single node, measure all of
    those currents by inserting a current meter in series with
    each, using the same polarity for all (say, positive meter
    lead toward the node in question) and add the currents up
    and see how close to zero the total is.

    Both these experiments may show a small non zero total,
    because of measurement tolerances and the the fact that you
    have not corrected for the way the measurements change the
    situation. But the results should be pretty close to zero.
    Your analysis of the experiment should delve into these
    effects.
     
  4. PeteS

    PeteS Guest

    If the OP can access a.b.s.e I might put a schematic of a test circuit;
    it's up to the OP to do the measurement, of course.

    Having taught, I understand the gap between what one hears from a
    lecturer and actually constructing something to test it - besides, it's
    s.e.b and New Year to boot :)

    Cheers

    PeteS
     
  5. PeteS

    PeteS Guest

    Posted to a.b.s.e
     
  6. Rich Grise

    Rich Grise Guest

    Nah - googlegroups.

    Thanks,
    Rich
     
  7. Kirchhoff's voltage law ... a series circuit should do it (measure all the
    voltage rises and drops and they should sum to zero).

    Kirchhoff's current law ... a parallel circuit should do it (measure all
    the node currents and they should sum to zero).

    Or, get fancy and use an unbalanced bridge circuit to demonstrate both laws
    (lots of loops and nodes to play with). Your Prof will be impressed!
     
  8. PeteS

    PeteS Guest

    Hey - I tried :)

    Cheers

    PeteS
     
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