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single phase C question

  • 28-06-2005 7:48am
    #1
    eurotrotter
    Registered Users, Registered Users 2 Posts: 1,073 ✭✭✭


    im doing a prolem at the moment
    and in the solution, it is determined from the cos of fie that the current is lagging the voltage
    cos fie was equeal to 0.705
    how could he tell from this that is was lagging?


Comments

  • #2
    Molly
    Closed Accounts Posts: 2,256 ✭✭✭Molly


    As far as i can remember

    Positive cos of phi = voltage leading, current lagging
    Negative cos of phi = current leading, voltage lagging


  • #3
    eurotrotter
    Registered Users, Registered Users 2 Posts: 1,073 ✭✭✭eurotrotter


    Molly wrote:
    As far as i can remember

    Positive cos of phi = voltage leading, current lagging
    Negative cos of phi = current leading, voltage lagging


    ya i think your rite there bud
    thanks


  • #4
    SparkyLarks
    Registered Users, Registered Users 2 Posts: 363 ✭✭SparkyLarks


    the cos of 20 degrees positive or negative will be positive.

    If phi is positive the Voltage is leading
    If phi negative Voltage is lagging

    I think
    you just know from the x+jy form


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