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Type: Posts; User: Ratch

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  1. Replies
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    Closed: Re: PN junction in thermal equilibrium

    Concentration gradients cause carriers to leave where they are not wanted and go where the are welcomed. Because they are charged particles, they cause ions to form when they leave and also form...
  2. Closed: Re: Misconceptions and flaws noticed by the more educated...

    Unless the models closely follow the physics of the device, they will only only give valid results in limited circumstances and need to be used cautiously.

    Ratch
  3. Closed: Re: Misconceptions and flaws noticed by the more educated...

    A BJT is a transconductance device (Vbe controls Ic). The base current is a result of the collector current, not the cause of the collector current. The physics of the BJT shows that. Can you...
  4. Closed: Re: Misconceptions and flaws noticed by the more educated...

    You think wrong. NASA gets around by "walking" in space, even though it looks more like they are floating outside of their space ships. You will design better circuits knowing how BJTs really work....
  5. Closed: Re: The simplest definition of VOLTAGE you can come up with

    The electric field increase is a measure of the difference in the energy density of the field. Therefore, if it measures X volts to move 1 coulomb of charge to a new position against a field, it...
  6. Closed: Re: The simplest definition of VOLTAGE you can come up with

    It has to do with both the electric field and the number of charge carriers. It takes/gives more voltage to move several charge carriers to/from an electric field difference than it does for a...
  7. Closed: Re: Misconceptions and flaws noticed by the more educated...

    What is the point you are trying to make in the above post?

    Ratch
  8. Closed: Re: The simplest definition of VOLTAGE you can come up with

    Do mechanical or hydraulic engineers study electrical analogs when they learn the units of their craft? If not, then why do electrical science engineers sometimes learn about their working units by...
  9. Closed: Re: Misconceptions and flaws noticed by the more educated...

    Not so, the terminals of a battery can have a voltage difference with no current present between them.


    Who is advocating replacing old models?

    If a model is not correct or truthful, what...
  10. Closed: Re: Misconceptions and flaws noticed by the more educated...

    I hate to say it, but what you pontificate above is mostly blather. Please excuse me for being so direct.

    Ratch
  11. Closed: Re: Misconceptions and flaws noticed by the more educated...

    I am thinking of many centuries of yesteryear when a heavy ice sheath covered most of the northern hemisphere and eventually disappeared due to natural global warming. It did so without heavy...
  12. Closed: Re: Misconceptions and flaws noticed by the more educated...

    A current has to have a voltage associated with it to pass through a resistance.

    Ratch
  13. Closed: Re: Misconceptions and flaws noticed by the more educated...

    It would be nice if you separated my post in quote shading followed by your replies so readers can better follow the dialog.

    Ohm's law is a law and a definition is a definition. For instance,...
  14. Closed: Re: The simplest definition of VOLTAGE you can come up with

    Of course. In a current loop, the charges are distributed evenly, but the energy is not. Therefore, the voltages are different along the points of the conduction path.



    I never said more...
  15. Closed: Re: The simplest definition of VOLTAGE you can come up with

    Look at the units of voltage, joules/coulomb. It is the energy density of the charge. It takes energy to bring two charge carriers from infinity together to within a certain distance from each...
  16. Closed: Re: Misconceptions and flaws noticed by the more educated...

    Sure, there are quite a few thing that are taught wrong.

    1) Scientific slang such as "current flow", which literally means "charge flow flow", and is redundant and ridiculous. One should instead...
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    Closed: Re: 2nd order opamp circuit

    I will solve this problem using Laplace transforms and taking into consideration the amplification of the opamp. First I write the equations of the circuit. "amp" is the amplification of the opamp...
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    Closed: Re: the second edition of the book

    The 3rd edition has about 200 more pages.

    Ratch
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    Closed: Re: Kirchoff’s Current Law. Solve node P2

    You are given 4 assumed current directions into a node and three finite currents. Using the mathematical convention, current into a node is assumed to be negative and vice-versa for current leaving...
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    Closed: Re: Tricky Algebra! Help

    Not tricky, just simple.
    151257

    Ratch
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    Closed: Re: About Impedance matching

    Your first sentence is wrong. To simplify the discussion, assume only resistances. It is true that max power transfer is obtained by adjusting the load resistance to the source resistance, if the...
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    Closed: Re: Better understanding of capacitor charging

    As you can see from this link http://hyperphysics.phy-astr.gsu.edu/hbase/electric/pplate.html , the closer the plates, the higher the capacitance and the lower the voltage. The electrostatic field...
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    Closed: Re: Better understanding of capacitor charging

    There is more to physics than MLT. There is a bunch of energy forms, fields of all kinds, force, torque, momentum, nuclear, and who knows what else.

    Temperature is a heat energy density of a...
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    Closed: Re: Better understanding of capacitor charging

    Because voltage is not a volumetric density. It is an energy density, similar to temperature (heat energy/mass)



    How so?



    Mechanical energy is, but there are many different forms of...
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    Closed: Re: Better understanding of capacitor charging

    I should have said that "voltage is the energy density per unit charge". That is my corrected statement. That is why voltage units are joules/coulomb.



    What you say above is basically true,...
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