GR8677 #64



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physics_guy 20180808 21:13:34  There are two kinds of impedance matching. One minimizes reflection at the boundary between materials, and the other maximizes power transfer between two materials. To minimize reflection, the impedance of the generator must equal the impedance of the load. To maximize power transfer, the impedance of the generator must equal the complex conjugate of the impedance of the load. If we wanted to minimize reflection, (B) would be the correct answer. Since we instead want to maximize power transfer, (C) is the correct answer.   Marian 20160105 08:57:59  http://http://grephysics.net   Marian 20160105 08:56:56  Neige Hunter: montres, nerds pourrait knock réplique Breitling Bentley Flying B plongée en apnée, il est prêt, durée du rythme cardiaque, mais tout le monde peut être dit de se concentrer sur la conception, \"et alors, regardez cette heure génial !.\"\r\n\r\nreplique " target="_blank">http://www.repliquemontresfr.eu\">replique montre   Marian 20160105 08:56:09  http://www.repliquemontresfr.eu   nishamgu 20111219 22:56:11  prove the commutation relation[L_k,r^2]=0 where r is the radius vector   jw111 20080901 15:11:23  You need to know two things
(1) The impedance is the resistance of object in AC circuit.
(2) The imaginary part of impedance control the PHASE of voltage(cross the object) and current (through the object).
In this problem, we can treat the circuit as an IDEA POWER SOURCE + an OBJECT with impedance equal to
with the max power transfer to the OBJECT
the phase of V and I must be inphase that the imaginary part of effective impedance must be .
Thus   RebeccaJK42 20070315 14:22:16  Why is it negative Xg and not positive Xg?
Blake7 20070921 19:18:17 
One needs the 'imaginary' reactances to cancel out and thus 'match the impedance'

  sharpstones 20061019 13:49:09  What's this about a capacitor and an inductor? Problem 64 from 86 exams says "An alternating current electrical generator has a fixed internal impedance..." ?   yosun 20051206 20:24:53  jax: thanks for the correction.   jax 20051202 21:27:25  This one confused me at first so let me clarify,
To maximize the power transfer, the impedance needs to be 'matched'. The impedance is 'matched' if the load impedance equals the complex conjugate of the source impedance, .
In our case maximizes the power transfer, so .
jax 20051202 21:28:16 
Lots more info here: http://en.wikipedia.org/wiki/Impedance_matching#Complex_conjugate_matching

RusFortunat 20151021 14:21:02 
Now it is clear. Thank you

 

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