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  1. R

    leading or lagging of voltage?

    That aphorism only applies to sinusoidal voltages and currents. Applying a voltage across the plates of a capacitor causes a charge imbalance. The relationship is Q = C*V, where Q is the charge imbalance in coulombs, C is the capacitance in farads, and V is the voltage is volts. As you can...
  2. R

    SO Im a newbie

    In less time that it takes to think about it, I Googled "using capacitors" and found this link on the net. See if this helps you. http://www.facstaff.bucknell.edu/mastascu/elessonshtml/LC/Capac1.htm Ratch
  3. R

    SO Im a newbie

    How does one learn anything from scratch? Read elementary texts, magazines, take courses, peruse the internet. How would you learn a trade like welding? Search around and ask at trade schools and libraries, Ratch
  4. R

    SO Im a newbie

    That is like explaining how a car functions. It is too much to do in one posting. What specific part of the schematic don't you understand? Perhaps you need to study elementary electronics first. Ratch
  5. R

    logic in proteus

    Sounds like a heavy duty expensive weapons system like the Forbin Project. I wonder how many folks on this thread own a license for this, or know how to run it. Ratch
  6. R

    logic in proteus

    What is "protues"? Ratch
  7. R

    How a BJT Transistor works (base current version)

    "Charge transport is due to drift, where an electric field imparts force on charges, and diffusion, where density gradients determine charge motion." No, drift is an insignificant contribution to current in the forward direction. It is limited by its thermal equilibrium value. See first file...
  8. R

    How a BJT Transistor works (base current version)

    Because without diffusion, there would be no significant charge transport. Diffusion is one method of charge transport. Yes, but drift is an insignificant part of a forward-biased diode. You can see how little it is by reverse-biasing a diode, which cuts off the diffusion current, and...
  9. R

    How a BJT Transistor works (base current version)

    No, Claude, you did not. All those things you listed above are either the effect from charge transport or have nothing to do with moving charges. They are not the cause. Like, for instance, photon emission, unless it is a phototransistor. I don't recall you ever mentioning that diffusion is...
  10. R

    How a BJT Transistor works (base current version)

    Ho-hum, Claude. Another moderately high frequency AC simulation which shows a current-voltage phase difference due to the junction capacitance, small as it is. Still no explanation using junction diode physics relating to your assertion that current controls voltage. You cannot determine...
  11. R

    question about ohm's law

    You should read this link http://www.electro-tech-online.com/threads/ohms-law.430/page-2 starting with my contribution on post #22. Then we can discuss it further. Ratch
  12. R

    Maximum Power through a L-R circuit

    e21958, You can solve for R analytically for the maximum/minimum value by taking the derivative of the power equation with respect to R, setting the derivative to zero, and solving for R. Since the inductor and resistor are in series, they both pass the same current. Since R's resistance and...
  13. R

    Maximum Power through a L-R circuit

    The current existing in the circuit is 100/sqrt(1^2+r^2), where sqrt(1^2+r^2) is the absolute value of the impedance. The power dissipated in the resistor is (I^2)*r , which comes out to( (100/sqrt(1^2+r^2)^2)*r . Taking the derivative with respect to "r" and finding the value of r for the max...
  14. R

    How a BJT Transistor works (base current version)

  15. R

    How a BJT Transistor works (base current version)

    Why do you mention products that are complex and consist of many parts? We are talking about a single part. How does the way a BJT is used have to do with how it is controlled? I propose you first understand the physics of the device, a BJT in this case, then apply a voltage or current to the...
  16. R

    How a BJT Transistor works (base current version)

    All by itself? Easy. Take a junction diode, for example. Hook up a power supply and ammeter in series with the diode and measure the current as the voltage is slowly increased. What question is that? A FET can be tested and described by itself. Yes, BJTs, FETs, and tubes are all voltage...
  17. R

    How a BJT Transistor works (base current version)

    No, an inductor is an energy storage device. It does not contain any energy in its magnetic field until current exists in its wire. The diode responds to the voltage across it even if that voltage is supplied by a CCS. Its that clear. Ratch
  18. R

    How a BJT Transistor works (base current version)

    Claude, Did I ever say that an inductor included a resistor? What does a discussion of how a inductor works in a circuit have to do with a BJT being anything other than a voltage controlled current source? You should identify who said otherwise, so as to save the readers the work of searching...
  19. R

    How a BJT Transistor works (base current version)

    What weird stuff is being claimed? How does a discussion of a CVS and CCS uphold your argument that a BJT can be thought6 of as a current controlled device? Ratch
  20. R

    How a BJT Transistor works (base current version)

    Again you exhibit circuits with lots of energy storage elements and attempt to show that devices exhibit this behavior. Wrong! A device has to be analyzed by itself, not in a circuit. Ratch
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