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Basic electronics

Discussion in 'Electronic Basics' started by Richard Harris, Jan 17, 2005.

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  1. Hi,

    Current is directly proportional to Voltage.
    E=I

    There for I=E, E=9V, I=9A ?

    If this is so, how come you can get a 4.8 V battery in 720 mA and in
    1200 mA ?

    Would this 4.8 battery allow you to connect to a device that required a
    4.8A load?

    Thanks.
     
  2. Andrew Holme

    Andrew Holme Guest

    Proportional does not mean equal. Resistance is the constant of
    proportionality:

    E = IR or I =E/R
    Are you quoting maximum current (mA) or capacity in milliamp-hours (mAh)
    there?
    Possibly, yes. What sort of battery is it? Can you post a link to the
    spec?

    The capacity (= stored charge = current * time) determines how long it will
    last.
     
  3. in a resistive circuit.
    No - E = I/R
    No. The current depends on the resistance, as well as the voltage.
    I suspect that your 4.8 V batteries have a _capacity_ of 720 mA-hours
    or 1200 mA-hours. That is, they could theoretically deliver 720 mA
    (or 1200 mA) for an hour before becoming fully discharged.
    Yes - but it won't run it for long.
     
  4. Bob Myers

    Bob Myers Guest

    Ummmmm...Peter?.....:)

    Bob M.
     
  5. jim w

    jim w Guest

    Obviously, he meant conductance, not resistance, in that post. ;-)
     
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