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How do I measure Current Draw??

Discussion in 'Beginner Electronics' started by JD, Sep 16, 2003.

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  1. JD

    JD Guest

    Hi guys,
    Sorry for the simplistic question but I need to find how many Amps an
    electric water pump in a car is using. The thing has a supply and
    ground wire(s). How do I do it??

  2. Spudley

    Spudley Guest

    Place a multimeter in series with the supply lead to the water pump.
    Set the multimeter to the highest current range. 10 Amp preferably.
    Then read the pointer against the scale or the digital value represented
    there in.
    Make sure you get a Multimeter that contains operator instructions
    on how to set the proper range and which terminals of the multimeter
    you should use for highest current range. Make sure you have the polarity
    the right way around as well.
    *Note* If the device draws more than the maximum current that the multimeter
    can read, it is likely that smoke will escape from the components inside the
    multimeter and even blow the protection fuse "if one exists inside the meter
    that is".

    I=E/R :)
  3. miketinte

    miketinte Guest

    Get a multimeter from Home Depot/Lowe's/etc. and place it on the
    Ammeter setting. Remove the supply wire from one end and place the
    Ammeter leads between the now-loose end, and the point from which you
    took it off. Polarity doesn't matter, you will just get a different
    sign for your current depending which way you hook the leads up.
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