Charging a Capacitor

Whenever we connect an uncharged or partly charged capacitor with a voltage source whos voltage is more than the voltage of the capacitor (in case of partly charged capacitor) it recieves charge from the source and the voltage across the capacitor rises exponentially until it becomes equal and opposite to voltage of the source. Let … Read more

Working Principle of a Capacitor

To demonstrate how does a capacitor work, let us consider a most basic structure of a capacitor. It is made of two parallel conducting plates separated by a dielectric that is parallel plate capacitor. When we connect a battery (DC Voltage Source) across the capacitor, one plate (plate-I) gets attached to the positive end, and … Read more

What is Capacitor? What is Capacitance?

There are three fundamental electronic components that form the foundation of a circuit – resistors, inductors, and capacitors. A capacitor in an electrical circuit behaves as a charge storage device. It holds the electric charge when we apply a voltage across it, and it gives up the stored charge to the circuit as when required. … Read more

Capacitors in Series and Parallel

Capacitor in Series Let us connect n number of capacitors in series. V volt is applied across this series combination of capacitors. Let us consider capacitance of capacitors are C1, C2, C3…….Cn respectively, and equivalent capacitance of series combination of the capacitors is C. The voltage drops across capacitors are considered to be V1, V2, … Read more

Transient Behavior of Capacitor

When a voltage is suddenly applied across a capacitor, which are previously uncharged, electrons shifting from source to capacitor to source start immediately. In other words, accumulation of change in the capacitor starts instantly. As the charge accumulating in the capacitor increases, the voltage developed across the capacitor increases. The voltage developed across the capacitor … Read more

Discharging a Capacitor

Let us connect a charged capacitor of capacitance C farad in series with a resistor of resistance R ohms. We then short circuit this series combination through switching on the push switch as shown. As soon as the capacitor is short circuited, it starts discharging. Discharging means, the capacitor giving up the stored charge in … Read more

Quality Factor of Inductor and Capacitor

Quality Factor of Inductor Every inductor possesses a small resistance in addition to its inductance. The lower the value of this resistance R, the better the quality of the coil. The quality factor or the Q factor of an inductor at the operating frequency ω is defined as the ratio of reactance of the coil … Read more

Energy Stored in Capacitor

While capacitor is connected across a battery, charges come from the battery and get stored in the capacitor plates. But this process of energy storing is step by step only. At the very beginning, capacitor does not have any charge or potential. i.e. V = 0 volts and q = 0 C. Now at the … Read more

How to Test Capacitors?

Capacitors, we all know that they are charge storing devices. It should have to be checked and tested during servicing or troubleshooting in almost all the Electrical and Electronics circuits. For testing the capacitors, different methods are adapted. They are briefed below. Traditional Method to Test Capacitors This method is really dangerous and is recommended … Read more