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Séance de cours

Capacité et diélectrique : séance de questions-réponses sur l’apprentissage mixte

Dans cours

PHYS-201(d): General physics: electromagnetism

The topics covered by the course are concepts of electromagnetism, properties of waves, and fluid mechanics. ...

Description

Cette séance de cours couvre les concepts de capacité et de diélectrique, discutant de la façon dont l'insertion d'un diélectrique affecte la capacité et le champ électrique, la quantité maximale de charges liées dans un diélectrique et le stockage d'énergie dans différents corps. La session comprend une séance de questions-réponses sur des scénarios pratiques impliquant des condensateurs à plaques et des diélectriques.

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Enseignant·e

Dirk Grundler

Source officielle

Proximité ontologique

Physique

Électromagnétisme: Électrostatique

Concepts associés (32)

Capacitor types

Capacitors are manufactured in many styles, forms, dimensions, and from a large variety of materials. They all contain at least two electrical conductors, called plates, separated by an insulating layer (dielectric). Capacitors are widely used as parts of electrical circuits in many common electrical devices. Capacitors, together with resistors and inductors, belong to the group of passive components in electronic equipment.

Tantalum capacitor

A tantalum electrolytic capacitor is an electrolytic capacitor, a passive component of electronic circuits. It consists of a pellet of porous tantalum metal as an anode, covered by an insulating oxide layer that forms the dielectric, surrounded by liquid or solid electrolyte as a cathode. Because of its very thin and relatively high permittivity dielectric layer, the tantalum capacitor distinguishes itself from other conventional and electrolytic capacitors in having high capacitance per volume (high volumetric efficiency) and lower weight.

Electrolytic capacitor

An electrolytic capacitor is a polarized capacitor whose anode or positive plate is made of a metal that forms an insulating oxide layer through anodization. This oxide layer acts as the dielectric of the capacitor. A solid, liquid, or gel electrolyte covers the surface of this oxide layer, serving as the cathode or negative plate of the capacitor. Because of their very thin dielectric oxide layer and enlarged anode surface, electrolytic capacitors have a much higher capacitance-voltage (CV) product per unit volume than ceramic capacitors or film capacitors, and so can have large capacitance values.

Film capacitor

Film capacitors, plastic film capacitors, film dielectric capacitors, or polymer film capacitors, generically called film caps as well as power film capacitors, are electrical capacitors with an insulating plastic film as the dielectric, sometimes combined with paper as carrier of the electrodes. The dielectric films, depending on the desired dielectric strength, are drawn in a special process to an extremely thin thickness, and are then provided with electrodes.

Applications of capacitors

Capacitors have many uses in electronic and electrical systems. They are so ubiquitous that it is rare that an electrical product does not include at least one for some purpose. Capacitors allow only AC signals to pass when they are charged blocking DC signals. The main components of filters are capacitors. Capacitors have the ability to connect one circuit segment to another. Capacitors are used by Dynamic Random Access Memory (DRAM) devices to represent binary information as bits.

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Séances de cours associées (32)

Diélectriques et condensateurs

Explore les diélectriques, les condensateurs, l'énergie électrique, la force et la résistivité dans les matériaux.

Diélectriques et condensateurs

Explore la loi de Gauss avec des diélectriques, des condensateurs idéaux et un blindage des charges.

Sans titre

Condensateurs et stockage d'énergie

Couvre la capacité, le stockage d'énergie, les diélectriques et la polarisation dans les circuits électriques.

Courant électrique: Définitions et concepts

Couvre le concept de courant électrique et ses conditions d'écoulement.

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