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Ohms Law Calculator

Discussion in 'General Electronics Discussion' started by Ian, Mar 4, 2010.

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  1. Ian

    Ian Administrator

    Aug 23, 2006
    Ohms Law defines the relationship between Voltage, Current and Resistance - as described in detail by this article. The tool on this page allows you to enter two known vaules and then calculate the third.
    • E (or V) = Voltage
    • I = Current
    • R = Resistance
    This calculator is based on the following simple equation:


    Which therefore means the following conditions are also true:



    In electric circuits, power is a function of both voltage and current:​


    Using algebra again to manipulate the formulae, we can take our original power formula and modify it for applications where we don't know both voltage and current:
    If we only know voltage (E) and resistance (R):


    If we only know current (I) and resistance (R):


    Last edited: Feb 25, 2011
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