Capacitor in AC Circuit: Why there is such relation of current and voltage?

In summary, the conversation discusses the relationship between voltage and current in an AC circuit. It is explained that when the voltage is zero, the current is at its maximum and vice versa. This is due to the current being proportional to the rate of change of voltage, meaning that as the voltage changes, the current follows suit. The conversation then moves on to discussing the proper use of written English in online communication.
  • #1
akmafia001
6
0
http://imageschip.com/image-2CC0_4D720BE9.jpg

In AC circuit when the voltage is zero the current is maximum...
When it reaches to 90 then the current is zero...
And same as for the other cycles till 360...

Why the current is maximum when the voltage is zero and when the voltage is maximum the current is zero...?

Please explain...
 
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  • #2
The current is proportional to the rate of change (derivative) of voltage.
 
  • #3
can u explain it a bit more?
 
  • #4
[tex]i = c \frac{dv}{dt}[/tex]Do you know what "rate of change" is?
 
  • #6
thnx... it helped...

uart can u apply some values on the above formula that u have mentioned?
 
  • #8
did i written something wrong?
 
  • #9
akmafia001 said:
did i written something wrong?
Yes. From the https://www.physicsforums.com/showthread.php?t=414380" "In the interest of conveying ideas as clearly as possible, posts are required to show reasonable attention to written English communication standards. This includes the use of proper grammatical structure, punctuation, capitalization, and spelling. SMS messaging shorthand, such as using "u" for "you", is not acceptable."
akmafia001 said:
thnx... it helped...

uart can u apply some values on the above formula that u have mentioned?
 
Last edited by a moderator:

1. What is a capacitor in an AC circuit?

A capacitor is an electronic component that stores electrical energy in the form of an electric field. In an AC circuit, a capacitor is used to store and release electrical energy as the direction of the current changes.

2. How does a capacitor affect the current and voltage in an AC circuit?

A capacitor in an AC circuit causes a phase shift between the current and voltage. This means that the current and voltage are not in sync and there is a time delay between them. The capacitor also has the ability to block or pass AC current, depending on the frequency of the circuit.

3. Why is there a relationship between the current and voltage in an AC circuit with a capacitor?

The relationship between current and voltage in an AC circuit with a capacitor is due to the behavior of the capacitor. When the voltage across the capacitor changes, it causes the charge on the capacitor to also change, which in turn affects the current in the circuit. This relationship is described by the capacitor's capacitance value.

4. How does the capacitance value of a capacitor affect the relationship between current and voltage in an AC circuit?

The capacitance value of a capacitor determines the strength of the electric field it can create and store. In an AC circuit, a higher capacitance value will result in a larger phase shift between the current and voltage. This means that a larger capacitor will have a greater effect on the relationship between current and voltage in an AC circuit.

5. What are some practical applications of a capacitor in an AC circuit?

Capacitors in AC circuits are used in a variety of applications such as power factor correction, filtering out unwanted frequencies, and energy storage. They are also commonly used in electronic devices to stabilize and regulate power supply voltages. In addition, capacitors are essential components in AC motors and generators, allowing for efficient operation and power transmission.

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