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Calculate capacitor current knowing only V and C?

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  1. zofofg is offline Junior Member
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    Calculate capacitor current knowing only V and C?

    hi everybody,

    I am going thru the questions and this is probably simple but I am really having trouble trying to do the math with this question

    A capacitor has a capacitance of 100 microfarads on a 120V 60Hz line, how much current flows through the capacitor?

    Can anybody help with the formula the correct answer is 4.52A

    Thanks in advance

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    Hi zofofg, this equation is a two part process. In order to calculate how much current is in the circuit we must first calculate the capacitive reactance:

    Xc = 1 / (2 * pi * frequency (in hz) * capacitance (in farads)) -> 1 / (2*3.14*60*0.0001) = 26.52 ohms

    Now that we know the resistance of the circuit, a simple ohms law calculation will give us the current:

    I = E/R -> I = 120/26.52 -> I = 4.52

    Hope this helps answer your question.

    Edits: sorry, I keep getting my Xc calculation screwed up.
    Last edited by veracon0700; February 26, 2015 at 07:35 AM.

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  5. zofofg is offline Junior Member
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    Thank you so much, i had the wrong formula trying to figure this out LOL

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