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  1. R

    Norton/Thévenin

    No, why do it in such a clunky clumsy way? First, find the open circuit voltage. That is 3*(9/13)=27/13 volts. Then find the short-circuit current. That is (3/(4+18/11))*(9/11) = 27/62 . Dividing the open circuit voltage by the short-circuit current gives 62/13 =4.76923 ohms for the...
  2. R

    Assistance with Transistor Theory

    KrizBlueNZ, Just a couple of comments. The nonlinearity of a BJT is the reason that transistor design textbooks aver that the input signal should not be more than 20 mV P-P. This small input approximates a straight line response. Anytime you use a current generator to drive a BJT, you are...
  3. R

    Assistance with Transistor Theory

    KrisBlueNZ, Most of the points you asked about were covered and explained in the thread. You simply have to get a grasp on the physics of the BJT to see how it controls controls its Ic in the active region. Then you can see that Ib is an indicator of the Ic, not the control. After a gas...
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    Assistance with Transistor Theory

    To the Ineffable All, For those interested, here is a discussion I had with a staff scientist of a big corporation. Judge for yourselves. Start with post #31 of the link below. http://www.electro-tech-online.com/threads/bjt-a-current-controlled-device.134889/page-2#post-1130919 Ratch
  5. R

    Capacitors

    Nice analogy. I like it. Ratch
  6. R

    Assistance with Transistor Theory

    "Merlin3189, post: 1637531, member: 20438"]At the risk of further red herrings, can I ask about something which has long puzzled me about these holes. Ratch said, "A lot of folks seem to think that a hole is simply a missing electron in the conduction band. The hole in the valance band is every...
  7. R

    Assistance with Transistor Theory

    KrisblueNZ, "I'm still not convinced that it's meaningful to describe a transistor as voltage-controlled." Perhaps I can help. "An LED won't light unless voltage is applied. Yet LEDs are described as current-driven, for two obvious reasons: (a) it's not normal or useful to connect a firmly...
  8. R

    Capacitors

    Gryd3, I did, twice. What does speed have to do with it? Who is doing that? No, I analyzed and corrected them. I know you are not attacking me. A disagreement is not an attack. "As stated, English is a complex language and not everyone is going to take the time to pick the best...
  9. R

    Capacitors

    I still don't know what you mean by a capacitive conductive path. Ratch
  10. R

    Capacitors

    As the capacitor accumulates and depletes charge on its plates, it forms a back-voltage that opposes the applied voltage to the capacitor. At lower frequencies, there is more time for the charges to accumulate and deplete so that a higher back-voltage can form. This results in less alternating...
  11. R

    Capacitors

    Gryd3, Speed is irrelevant. Precision of expression is important when explaining something. Nothing wrong with that, as long as I am correct in what I am saying. Much of the time it is grossly incorrect. Common and wrong. The mechanics of the capacitor are that it is not being charged...
  12. R

    Capacitors

    I never said there was a conduction path through a capacitor. If there was, it would be leaky and defective. What is a capacitive conduction path? Ratch
  13. R

    Capacitors

    An electric field can change continuously or remain the same. If it is changing, then it is no longer static. So an alternating voltage across a capacitor causes an electric field which is not static. Ratch
  14. R

    Capacitors

    chopnhack, Could you be a little more specific about what you are asking? I don't understand how your question relates to the two references you gave., Ratch
  15. R

    Capacitors

    "If "energy" is passing through the dielectric, but its not an electron, what is it?" It is an electrostatic field which, of course contains energy. "So then the charge on the other plate is "induced" is it by an electromagnetic field?" By the voltage applied to the capacitor terminals...
  16. R

    Capacitors

    "Perhaps the word 'charge' was used incorrectly, but that's what it is." What does the above sentence mean? How was it used incorrectly? What is "it"? "An electron carries a negative charge, which when placed on one plate, repels an electron off the other plate. This can and often is looked...
  17. R

    Capacitors

    That is because a lot of misconceptions need to be corrected. No, charges do not pass from one plate to the other. They accumulate on one plate and deplete on the opposite plate. How? That is not current passing through the capacitor. It is the charge accumulating on one plate and depleting...
  18. R

    Capacitors

    Charge flow is current. No, unless there is a conduction path through the capacitor, no current can exist through the capacitor. An equality of charge flow does not mean there is a path through the capacitor. Ratch
  19. R

    Capacitors

    Yes, energy can pass through the dielectric, but not a charge carrier like an electron, which consists of a charged mass. Also a capacitor is not like an open switch because the plates are a lot closer together and have more area than the contacts of a switch. An open switch will not pass...
  20. R

    Capacitors

    http://en.wikipedia.org/wiki/Displacement_current A most confusing presentation. Displacement current is a misnomer. As the link above says, "However, it is not an electric current of moving charges, but a time-varying electric field." It has the same units as current, but it is not current...
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