金版新学案物理必修三.pdfVIP

金版新学案物理必修三

英文回答：

1.Describethestructureandfunctionofacapacitor.

Acapacitorisapassiveelectroniccomponentthat

storeselectricalenergyinanelectricfield.Itconsists

oftwoconductorsseparatedbyaninsulatingmaterial

(dielectric).Whenavoltageisappliedacrossthe

capacitor,electricchargesofequalmagnitudebutopposite

polarityaccumulateontheconductors.

Function:Capacitorsstoreelectricalenergyand

releaseitwhenneeded.Theyareusedinvariouselectronic

circuits,includingpowersupplies,filters,andtiming

circuits.

2.Explainhowacapacitorstoreselectricalenergy.

Whenacapacitorisconnectedtoavoltagesource,

chargesflowfromoneconductortotheotherthroughthe

dielectric.Thisresultsintheaccumulationofelectric

chargesontheconductorsandthecreationofanelectric

fieldbetweenthem.Theenergystoredinacapacitoris

givenbytheequation:

E=1/2CV^2。

where:

Eistheenergystoredinjoules.

Cisthecapacitanceinfarads.

Visthevoltageacrossthecapacitorinvolts.

3.Discussthedifferenttypesofcapacitorsandtheir

applications.

Therearevarioustypesofcapacitors,eachwithits

uniquepropertiesandapplications.Commontypesinclude:

Ceramiccapacitors:Smallandinexpensive,usedfor

general-purposeapplicationslikefilteringandbypass

circuits.

Electrolyticcapacitors:Highcapacitance,usedfor

energystorageandsmoothingvoltageripples.

Filmcapacitors:Stableandreliable,usedinhigh-

frequencyapplicationsandaudiocircuits.

Supercapacitors:Extremelyhighcapacitance,capable

ofstoringlargeamountsofenergyforshortperiods.

中文回答：

1.描述电容器的结构和功能。

电容器是一种无源电子元件，它将电能存储在电场中。它由两

个由绝缘材料（电介质）分开的导体组成。当在电容器两端施加电

压时，大小相等但极性相反的电荷积聚在导体上。

功能，电容器存储电能并在需要时释放它。它们用于各种电子

电路中，包括电源、滤波器和定时电路。

2.解释电容器如何存储电能。

当电容器连接到电压源时，