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    plumjon's Avatar
    plumjon Posts: 3, Reputation: 1
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    #1

    May 20, 2009, 10:18 AM
    Resistive and conductive loads
    Can you tell me the difference between a conductive load and a resistive load. Also the relationship between voltage current an amps within the two loads
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #2

    May 20, 2009, 11:09 AM

    I think you mean inductive. Conductance in Siemens is 1/R.

    If the voltage and cuurent are sinusoidal, the following relationship applies:

    P = V*I*cos(theta)

    Where theta is the phase ange between voltage and current.

    For a resistive load cos(theta)) is 1.

    Cos(theta) is known as the power factor.

    For non-sinusoidal loads, it's a new ball game.

    Instantaneous power is V(t)*I(t). If it's periodic power, the relationship for power is the integral of v(t)*i(t) dt from o to t. I think it's divided by 2. Look in a Calculus book for average value of a function.

    Odd things can happen because v can be positive and I negative etc.

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