Which statement describes how a capacitor behaves with DC and AC?

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Multiple Choice

Which statement describes how a capacitor behaves with DC and AC?

Explanation:
Capacitors respond differently to DC and AC because their impedance depends on frequency. With DC, once a capacitor charges, no steady current can flow through it, so it effectively blocks DC. For AC, the voltage keeps changing, causing current to move through the capacitor; the amount of AC current depends on frequency: the higher the frequency, the smaller the capacitive reactance (Xc = 1/(2πfC)), so more of the AC signal can pass. At low frequencies, it blocks more; at high frequencies, it passes more easily. That’s why the best description is that it blocks DC and passes AC depending on frequency.

Capacitors respond differently to DC and AC because their impedance depends on frequency. With DC, once a capacitor charges, no steady current can flow through it, so it effectively blocks DC. For AC, the voltage keeps changing, causing current to move through the capacitor; the amount of AC current depends on frequency: the higher the frequency, the smaller the capacitive reactance (Xc = 1/(2πfC)), so more of the AC signal can pass. At low frequencies, it blocks more; at high frequencies, it passes more easily. That’s why the best description is that it blocks DC and passes AC depending on frequency.

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