Newbie trying to understand

Discussion in 'Homework Help' started by Graysonrobert, Aug 7, 2014.

  1. Graysonrobert

    Thread Starter New Member

    Aug 7, 2014
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    A problem that my professor gave me.

    A 5kw 240v motor has current measured at 14Amps. The meter shows that the motor is drawing 2kw. Draw vectors of voltage and current! And calculate power factor... I'm lost any help would be appreciated
     
  2. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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    p.f. = watts / volt amperes

    so 2000 / 240x14 = p.f.

    that may get you started. Was this not given in your class material or in lecture?
     
  3. Graysonrobert

    Thread Starter New Member

    Aug 7, 2014
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    That would be 1.68. I didn't think the pf could be more than 1
     
  4. t_n_k

    AAC Fanatic!

    Mar 6, 2009
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    No - that would be 0.595, which is OK.
     
  5. shteii01

    AAC Fanatic!

    Feb 19, 2010
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    I thought 14 A applied to the 5 kW value. Why are you using it for 2 kW?
     
  6. t_n_k

    AAC Fanatic!

    Mar 6, 2009
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    The motor is stated to be drawing 2kW real power. The 5kW is probably indicating the motor (nameplate) rating.
     
  7. shteii01

    AAC Fanatic!

    Feb 19, 2010
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    Ok. Thank you.
     
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