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

В автомобильных радиоприемниках используются конденсаторы для фильтрации частот для четкого приема сигнала.
Конденсаторы состоят из двух параллельных проводящих пластин, разделенных диэлектриком, и накапливают энергию в своем электрическом поле.
При подключении источника напряжения положительные и отрицательные заряды накапливаются на противоположных пластинах, создавая разность потенциалов, равную произведению электрического поля на расстояние между пластинами до тех пор, пока она не достигнет напряжения источника.
Электрическое поле пропорционально плотности заряда, задаваемой общим зарядом, деленным на площадь пластин.
Накопленный заряд прямо пропорционален приложенному напряжению, а константа пропорциональности, известная как емкость, указывает на количество накопленного заряда для создания заданной разности потенциалов. Он измеряется в фарадах.
Для конденсаторов с диэлектриком емкость прямо пропорциональна площади пластины и диэлектрической проницаемости, но обратно пропорциональна расстоянию между пластинами.
Дифференцирование уравнения заряд-напряжение конденсатора по времени дает ток.
Заряженные конденсаторы разряжаются при подключении к нагрузке, а электроны текут в обратном направлении до тех пор, пока потенциал не достигнет нуля.

Конденсаторы

Конденсаторы играют решающую роль в автомобильных радиоприемниках, где они фильтруют и сохраняют частоты, чтобы обеспечить четкий прием сигнала. Конденсаторы, по сути, служащие устройствами накопления энергии, хранят энергию в своем электрическом поле. Эти устройства состоят из двух параллельных проводящих пластин, разделенных диэлектриком.

Когда источник напряжения подключен к конденсатору, на противоположных обкладках накапливаются положительные и отрицательные заряды. Это накопление создает разность потенциалов, равную произведению электрического поля и расстояния между пластинами. Этот процесс продолжается до тех пор, пока разность потенциалов не достигнет напряжения источника.

Электрическое поле внутри конденсатора пропорционально заряду, накопленному на пластинах, и площади пластин. Сохранённый заряд прямо пропорционален приложенному напряжению. Константа пропорциональности в этом соотношении известна как электроёмкость, или ёмкость, и представляет собой количество заряда, необходимое для создания заданной разности потенциалов. Единица измерения электроёмкости - фарад.

Для конденсаторов с параллельными пластинами емкость прямо пропорциональна площади пластин и диэлектрической проницаемости диэлектрика, которая представляет собой способность материала хранить электрическую энергию. Между тем емкость обратно пропорциональна расстоянию между пластинами; чем ближе пластины, тем выше емкость.

Дифференцируя уравнение заряда-напряжения конденсатора по времени, можно определить ток, текущий через конденсатор. Это особенно важно при рассмотрении поведения конденсаторов в схемотехнике.

Более того, когда заряженный конденсатор подключен к нагрузке, он разряжается. Во время этого процесса разрядки электроны текут в обратном направлении, пока разность потенциалов на пластинах не достигнет нуля. Эта способность хранить и выделять электрическую энергию делает конденсаторы чрезвычайно важными компонентами многих электронных устройств. Понимая, как они работают, инженеры могут разрабатывать более эффективные и действенные электронные системы.

В автомобильных радиоприемниках используются конденсаторы для фильтрации частот для четкого приема сигнала.
Конденсаторы состоят из двух параллельных проводящих пластин, разделенных ...

Education

JoVE Core

Electrical Engineering

Электротехника

Unit 1

Раздел 1

Energy Storage Elements

Элементы хранения энергии

KEY TERMS AND CONCEPTS

ОСНОВНЫЕ ТЕРМИНЫ И ПОНЯТИЯ

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

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equivalent capacitance

Capacitors in Series and Parallel

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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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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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IPC.6.B

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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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