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ENGINEERING SCIENCE CBA PAST PAPERS
TECHNICAL DRAWING CBA PAST PAPERS
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ENTERPRENEURSHIP CBA PAST PAPERS
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ENGLISH CBA LEVEL II PAST PAPERS
MATHEMATICS CBA PAST PAPERS
CBA TOURISM, TOUR GUIDE, HOTEL MANAGEMENT AND FOOD PRODUCTION
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ReplyDeleteA capacitor is a little like a battery but works completely differently. A battery is an electronic device that converts chemical energy into electrical energy, whereas a capacitor is an electronic component that stores electrostatic energy in an electric field. In this article, let’s learn about capacitors in detail.
ReplyDeleteTable of Contents
What Is a Capacitor?
How Does a Capacitor Work?
How Do You Determine the Value of Capacitance?
Energy Stored in a Capacitor
Standard Units of Capacitance
Capacitance of a Parallel Plate Capacitor
Capacitance of a Spherical Capacitor
Factors Affecting Capacitance
Applications of Capacitors
FAQs
What Is a Capacitor?
A capacitor is a two-terminal electrical device that can store energy in the form of an electric charge. It consists of two electrical conductors that are separated by a distance. The space between the conductors may be filled by vacuum or with an insulating material known as a dielectric. The ability of the capacitor to store charges is known as capacitance.
Capacitors store energy by holding apart pairs of opposite charges. The simplest design for a capacitor is a parallel plate, which consists of two metal plates with a gap between them. But, different types of capacitors are manufactured in many forms, styles, lengths, girths, and materials.
How Does a Capacitor Work?
For demonstration, let us consider the most basic structure of a capacitor – the parallel plate capacitor. It consists of two parallel plates separated by a dielectric. When we connect a DC voltage source across the capacitor, one plate is connected to the positive end (plate I) and the other to the negative end (plate II). When the potential of the battery is applied across the capacitor, plate I become positive with respect to plate II. The current tries to flow through the capacitor at the steady-state condition from its positive plate to its negative plate. But it cannot flow due to the separation of the plates with an insulating material.
Charging a Capacitor
An electric field appears across the capacitor. The positive plate (plate I) accumulates positive charges from the battery, and the negative plate (plate II) accumulates negative charges from the battery. After a point, the capacitor holds the maximum amount of charge as per its capacitance with respect to this voltage. This time span is called the charging time of the capacitor.
When the battery is removed from the capacitor, the two plates hold a negative and positive charge for a certain time. Thus, the capacitor acts as a source of electrical energy.
Capacitor as a source of energy
If these plates are connected to a load, the current flows to the load from Plate I to Plate II until all the charges are dissipated from both plates. This time span is known as the discharging time of the capacitor.
Discharging of Capacitor
How Do You Determine the Value of Capacitance?
Capacitor
The conducting plates have some charges Q1 and Q2 (Usually, if one plate has +q, the other has –q charge). The electric field in the region between the plates depends on the charge given to the conducting plates. We also know that potential difference (V) is directly proportional to the electric field hence we can say,