Why does Capacitors have high resistance in lower frequency?

Joson asked Oct 29,2020
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When having a capacitive circuit powered by AC, you get higher resistance as the frequency gets lower and lower. Why does that happen?

Also, does the same thing happen in AC circuits with no capacitance? The higher the frequency the more current?


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  • 1

    Dave jones does a decent explanation of why, see the video https://youtu.be/1xicZF9glH0

    Oct 30,20200 Comments
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  • 1

    It happens because current in a capacitor is proportional to the rate of change of voltage. Lower frequency means slower voltage change, therefore current drops. The same thing happen in AC circuits with no capacitance? Depends what else is in the circuit - if there's inductors, higher frequency will mean lower current since voltage is proportional to rate of change of current for inductors.

    Oct 30,20200 Comments
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  • 2

    Here are a few links that you may want to check out about impedance & reactance. All circuits have some associated capacitance & inductance even without these components installed. What is Impedance? -- http://www.learningaboutelectronics.com/Articles/What-is-impedance.php Capacitor Impedance -- https://hyperelectronic.net/wiki/capacitor/capacitor-impedance/ Reactance and Impedance of capacitor and inductor in AC circuit -- https://electric-shocks.com/reactance-impedance-capacitor-inductor/

    Oct 29,20200 Comments
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