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AC Voltage Applied to a Capacitor Video Lecture | Physics Class 12 - NEET
FAQs on AC Voltage Applied to a Capacitor Video Lecture - Physics Class 12 - NEET
| 1. What is AC voltage and how does it differ from DC voltage? |  |
Ans. AC voltage stands for alternating current voltage, which is a type of electrical voltage that alternates in direction and magnitude over time. It differs from DC voltage (direct current voltage) which flows in only one direction and maintains a constant magnitude.
| 2. How does a capacitor work in an AC circuit? | |
Ans. In an AC circuit, a capacitor stores and releases electrical energy as the voltage alternates. When the AC voltage is positive, the capacitor charges up and stores energy. When the voltage is negative, the capacitor discharges and releases the stored energy.
| 3. What happens when an AC voltage is applied to a capacitor? | |
Ans. When an AC voltage is applied to a capacitor, the capacitor charges and discharges repeatedly as the voltage alternates. The charging and discharging process causes the voltage across the capacitor to vary with the frequency of the AC signal.
| 4. How does the frequency of the AC voltage affect the behavior of a capacitor? | |
Ans. The frequency of the AC voltage determines how quickly the capacitor charges and discharges. Higher frequencies result in faster charging and discharging, while lower frequencies result in slower charging and discharging. This can affect the amount of energy stored and released by the capacitor.
| 5. Can a capacitor block or filter out certain frequencies of AC voltage? | |
Ans. Yes, a capacitor can act as a filter and block certain frequencies of AC voltage. Capacitors have impedance, which is frequency-dependent. At lower frequencies, the impedance of a capacitor is higher, causing it to block or reduce the flow of current. At higher frequencies, the impedance decreases, allowing the current to flow more easily. This property can be utilized to filter out specific frequencies in AC circuits.
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