Why capacitor is of no use when connected parallel to ac voltage source?
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DC has zero frequency, so reactance is infinity. This is the reason DC is blocked. While AC has some frequence, due to which capacitor lets it flow. ... hence the flow of electrons which represents electric current is stopped.
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The capacitor will have very little current flow and the voltage would be equal to the DC source so can be "ignored". ... Just as KVL forbids voltage sources in parallel, etc.
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