Name: capacitor charge and discharge
Uploaded: 2024-04-11T12:48:38.000Z
Duration: 1 min 15 s
Channel: JoVE

K12 Standards

Texas Essential Knowledge and Skills

High School

Chemistry and Physics

IPC.6

IPC.6.A

Capacitors

Les autoradios utilisent des condensateurs pour filtrer les fréquences afin d’obtenir une réception claire du signal.
Les condensateurs sont constitués de deux plaques conductrices parallèles séparées par un diélectrique et stockent de l’énergie dans leur champ électrique.
Lors de la connexion d’une source de tension, les charges positives et négatives s’accumulent sur les plaques opposées, générant une différence de potentiel égale au produit du champ électrique et de la distance entre les plaques jusqu’à ce qu’elle atteigne la tension de la source.
Le champ électrique est proportionnel à la densité de charge, donnée par la charge totale divisée par l’aire des plaques.
La charge stockée est directement proportionnelle à la tension appliquée, et la constante de proportionnalité, connue sous le nom de capacité, indique la quantité de charge stockée pour créer une différence de potentiel donnée. Il est mesuré en farads.
Pour les condensateurs à diélectrique, la capacité est directement proportionnelle à la surface de la plaque et à la permittivité diélectrique mais inversement proportionnelle à la distance entre les plaques.
En dérivant l’équation charge-tension d’un condensateur par rapport au temps, on obtient le courant.
Les condensateurs chargés se déchargent lorsqu’ils sont connectés à une charge, et les électrons circulent dans une direction inverse jusqu’à ce que le potentiel atteigne zéro.

condensateurs

Les condensateurs jouent un rôle crucial dans les autoradios, où ils filtrent et stockent les fréquences pour garantir une réception claire du signal. Servant essentiellement de dispositifs de stockage d'énergie, les condensateurs stockent l'énergie dans leur champ électrique et sont composés de deux plaques conductrices parallèles séparées par un diélectrique. Lorsqu'une source de tension est connectée à un condensateur, des charges positives et négatives s'accumulent sur les plaques opposées. Cette accumulation génère une différence de potentiel égale au produit du champ électrique et de la distance entre les plaques. Ce processus se poursuit jusqu'à ce que la différence de potentiel atteigne la tension source. Le champ électrique à l'intérieur d'un condensateur est proportionnel à la charge stockée sur les plaques et à la surface des plaques. La charge stockée est directement proportionnelle à la tension appliquée. La constante de proportionnalité dans cette relation est appelée capacité, qui indique la quantité de charge nécessaire pour créer une différence de potentiel donnée. L'unité utilisée pour mesurer la capacité est le farad. Pour les condensateurs à plaques parallèles, la capacité est directement proportionnelle à la surface de la plaque et à la permittivité du diélectrique, qui correspond à la capacité du matériau à stocker de l'énergie électrique. Pendant ce temps, la capacité est inversement proportionnelle à la distance entre les plaques ; plus les plaques sont proches, plus la capacité est élevée. En différenciant l'équation charge-tension d'un condensateur en fonction du temps, on peut déduire le courant circulant à travers le condensateur. Ceci est particulièrement important lorsqu’on considère le comportement des condensateurs dans les conceptions de circuits. De plus, lorsqu’un condensateur chargé est connecté à une charge, il se décharge. Au cours de ce processus de décharge, les électrons circulent dans le sens inverse jusqu'à ce que la différence de potentiel entre les plaques atteigne zéro. Cette capacité à stocker et à libérer de l’énergie électrique fait des condensateurs des composants inestimables dans de nombreux appareils électroniques. En comprenant leur fonctionnement, les ingénieurs peuvent concevoir des systèmes électroniques plus efficaces et efficients.

Condensateurs

Les autoradios utilisent des condensateurs pour filtrer les fréquences afin d’obtenir une réception claire du signal.
Les condensateurs sont constitués de deux plaques conductrices parallèles séparées par un ...

Education

Enseignement

JoVE Core

Electrical Engineering

Génie électrique

Unit 1

Unité 1

Energy Storage Elements

Éléments de stockage d'énergie

KEY TERMS AND CONCEPTS

TERMES ET CONCEPTS CLÉS

capacitor charge and discharge

Capacitors store electric energy and help control signals in devices like car radios. They work by holding charge on two parallel conducting plates with a dielectric, which is the insulating material between the plates.

When a voltage source is connected, positive charge builds up on one plate and negative charge builds up on the other. This charge separation creates a potential difference, and it keeps increasing until it matches the source voltage. The electric field inside the capacitor depends on the charge on the plates and the plate area.

The amount of charge stored is directly proportional to the applied voltage. The constant that links charge and voltage is called capacitance, and it is measured in farads. For a parallel plate capacitor, capacitance increases with larger plate area and with higher permittivity of the dielectric. Permittivity describes how well a material stores electrical energy. Capacitance also decreases when the plates are farther apart, so closer plates give a higher capacitance.

Capacitors also affect current in circuits. If the charge-voltage equation is differentiated with respect to time, it gives the current through the capacitor. When a charged capacitor is connected to a load, it discharges. Electrons then flow in the reverse direction until the potential difference drops to zero. This ability to store and release energy makes capacitors important in many electronic systems.

Capacitor Charge and Discharge

capacitors

Capacitors store electric energy and help control signals in devices like car radios. They work by holding charge on two parallel conducting plates with a dielectric, which is the insulating material between the plates. When a voltage source is connected, positive charge builds up on one plate and negative charge builds up on the other. This charge separation creates a potential difference, and it keeps increasing until it matches the source voltage. The electric field inside the capacitor...

energy stored in capacitors

Capacitor Voltage and Charge Behavior

Capacitor voltage and charge behavior depend on how a parallel plate capacitor connects to a battery. When the battery is attached, a potential difference forms across the plates. That voltage determines how much electrical energy the capacitor can store. The voltage across a capacitor can be found by integrating the equation that links voltage and current. That relationship lets students predict the voltage at any moment during charging or discharging. It also shows why a capacitor keeps a...

series and parallel capacitors

Capacitance in Series and Parallel

Capacitors in series and parallel affect a circuit in different ways. These arrangements change the total capacitance, which is the circuit's overall ability to store charge. Knowing the difference helps explain how a circuit responds to signals. When capacitors are connected in series to a battery, the plate tied to the battery's positive terminal becomes positively charged. The plate connected to the negative terminal becomes negatively charged. The other plates develop equal and opposite...

equivalent capacitance

Capacitors in Series and Parallel

Capacitors in series and parallel can be simplified by replacing the group with one equivalent capacitor. This equivalent capacitor stores the same charge as the original network when the same potential difference is applied. The idea helps make complex capacitor circuits easier to analyze. In a parallel connection, capacitors share the same voltage across each branch. The equivalent capacitance of N capacitors in parallel is the sum of their individual capacitances. This type of connection...

inductors

Inductors in Electric Circuits

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energy stored in inductors

How Inductor Current Stores Magnetic Energy

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series and parallel inductors

Equivalent Inductance in Circuit Networks

Equivalent inductance in circuit networks helps simplify circuits with multiple inductors. When inductors are combined, the circuit can often be replaced by one inductor with the same effect on the current and voltage. For inductors in series, the same current flows through each component. Applying Kirchhoff's voltage law shows that the total voltage is the sum of the inductor voltages. As a result, the equivalent inductance of a series group is the sum of the individual inductances. This is...

design example: automobile ignition system

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Car Spark Coil Voltage Design Example

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key terms and concepts

Learn how capacitors store charge, build potential difference, and discharge in circuits. See how plate area, distance, and dielectric affect capacitance.

Capacitor Charge and Discharge | JoVE K12

JoVE Core Electrical Engineering offers easy-to-understand animated videos that cover fundamental concepts of electric circuits along with circuit analysis techniques. It incorporates first-order and second-order circuits using operational amplifiers and circuit transformation concepts. The inclusion of practical design examples and real-world applications through scientist-in-action videos adds significant educational value, making complex concepts accessible.

electrical engineering

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Energy Stored in Capacitors

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IPC.6.B

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IPC.6.C

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IPC.6.D

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IPC.6.E

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IPC.6.F

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IPC.6.G

Science concepts. The student knows the impact of energy transfer and energy conservation in everyday life. The student is expected to:

Capacitor Charge and Discharge

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