# Charging and Discharging of a Capacitor

• g13nn
In summary, in a simple RC circuit with an ac supply, the capacitor charges during the positive cycle and discharges during the negative cycle through the resistor. The time taken for charging and discharging will be equal and there will be a sinusoidal voltage across the capacitor assuming the AC source is sinusoidal.
g13nn
In a simple RC circuit, where you have an ac supply attached to a capacitor and a resistor in series, during the positive cycle the capacitor starts to charge and it will reach a certain percentage then during the negative cycle the capacitor will start to discharge through the resistor. Will the time taken for the capacitor to charge be equal to the time taken for the capacitor to discharge?

Thanks in advance for the help

Yes. There will be a sinusoidal voltage across the capacitor assuming the AC source is sinusoidal.

Phrak said:
Yes. There will be a sinusoidal voltage across the capacitor assuming the AC source is sinusoidal.

Thanks a bunch mate, thought it was so just wanted to make sure.

## 1. What is a capacitor?

A capacitor is a device that can store electrical energy in the form of an electric charge. It is made up of two conductive plates separated by an insulating material, known as a dielectric.

## 2. How does a capacitor charge and discharge?

A capacitor charges and discharges through the movement of electrons. When a capacitor is connected to a power source, electrons flow from the source to one plate of the capacitor, creating a negative charge. Simultaneously, electrons are pulled from the other plate, creating a positive charge. When the capacitor is disconnected from the power source, the stored charge is released and the capacitor discharges.

## 3. What factors affect the charging and discharging of a capacitor?

The time it takes for a capacitor to charge and discharge can be affected by the capacitance of the capacitor, the voltage of the power source, and the resistance of the circuit. The type of dielectric material used in the capacitor can also impact the charging and discharging process.

## 4. What is the equation for calculating the time constant of a charging or discharging capacitor?

The time constant of a charging or discharging capacitor is calculated using the equation T = RC, where T is the time constant in seconds, R is the resistance in ohms, and C is the capacitance in farads.

## 5. Can a capacitor discharge on its own?

Yes, a capacitor can discharge on its own due to the leakage of charge through the dielectric material. This is known as self-discharge and is influenced by factors such as the type of dielectric material and the temperature. However, the rate of self-discharge is usually very slow and can be neglected in most practical applications.

Replies
15
Views
1K
Replies
2
Views
1K
Replies
15
Views
3K
Replies
2
Views
1K
Replies
3
Views
1K
Replies
28
Views
13K
Replies
12
Views
3K
Replies
1
Views
1K
Replies
7
Views
1K
Replies
8
Views
1K