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how to think current, voltage, …

Discussion in 'Electronic Basics' started by zooeb, Jan 4, 2005.

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  1. zooeb

    zooeb Guest

    I think electrical matter is very hard to grab, because current,
    voltage & C. are invisible. Even after years of practice I have some
    doubts about it. Here they are (someone): 1)voltage mean how many
    Newton every Coulomb is able to "put out". But, what is the difference
    between 1 Coulomb that has 100 Newton (for example) in it (ready to
    put out) and 1 Coulomb that has 200 Newton (for example) in it (ready
    to put out); in particolar what does it change in phase of generation
    of voltage? Why the second quantity of charge has more power?
    2)imagine a voltage generator empty (I mean it generate voltage, but
    there is no load attached to) so that current is zero, then imagine I
    prolong one of the two terminal, connecting to it a piece of wire of
    relevant lenght regard to the lenght of generator terminal. Just
    connected it; is there an electric current (even for a little while)
    which flow into the wire? I think yes, there is a current, because
    electric charges concentred in the terminal have the possibility to
    expand along the new wire. 3)OK, now imagine always the same situation
    of point number 2; and imagine of disconnecting the wire: all the
    electric charge which there were in it remains or falls down? 4) All
    generators I know behave similar to voltage generator: does it exist a
    similar current generator without electronic device (transistor,
    diode, ...) in it? 5) I'm thinking a way of imaging current, voltage,
    resistance, impedence, capacitance, inductance, electric field,
    magnetic field, electromagnetic field using duality with other
    matters. The easiest way is to think voltage like water pressure, but
    using hydraulic duality I think you are not able to introduce the
    concept of impedence, capacitance, electromagnetic fields, .... Have
    you a piece of advice about it? 6) Thank you very much, bye.
  2. Andrew Holme

    Andrew Holme Guest

    Here's my take on this: You have a voltage source. You extend (lengthen)
    the terminals. The extension is a capacitor. You are connecting a
    capacitor across a voltage source. Charge flows onto the capacitor.
    Finally, you remove the extension. This is like removing one of the plates
    of a capacitor. If you could physically do this, without discharging it, I
    think the plate (wire) would retain its electrostatic charge.
  3. Dan Dunphy

    Dan Dunphy Guest

    Top post.
    This has nothing to do with newtons, a physical unit of force.

    Energy E = 1/2 *C*V^2 . In the MKS system "joules".
    A joule is 1 watt-second
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