When is electric circuit's power transmitted most effectively?

Discussion in 'Homework Help' started by JK222, Feb 25, 2009.

  1. JK222

    Thread Starter New Member

    Feb 25, 2009
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    0
    Hello :)

    I'm sure this is an easy question, however I'm pretty new to physics so I'm asking you.. ... When is electric circuit's power transmitted most effectively?

    Thanks!
     
  2. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
    2,039
    287
    This occurs when the load impedance is the complex conjugate of the source impedance. This is true whether the circuit is DC, in which case the load and source will be simple resistances, or a complex Radio frequency system, with many impedance matching networks between source and load.

    eric
     
  3. JK222

    Thread Starter New Member

    Feb 25, 2009
    2
    0
    Thanks for the answer, Eric, though this bit of it confused me a little:

    ^ Does this mean is lower than or possibly equals? Sorry, I'm really new to this. :)
     
  4. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    It is from complex numbers terminology.

    A complex number

    x=a+jb

    has a conjugate of

    x*=a-jb

    For the case of the impedance this means it has equal magnitude but opposite reactance.
     
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