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Capacitors

Shpat Agushi Physics A-Level Inglés 9 fichas

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1Define Capacitance C=Q/Vthe charge stored per unit of p.d.
2How are capacitors constructed?Capacitors are constructed from two parallel metal plates separated by an insulator.
3Farad (unit of capacitance)A coulomb per volt.
1F = 1C/1V
4Time constant t=CRTime for the charge to have decreased to 1/ℯ of its initial charge
5Energy stored in capacitorAs charge increases, repulsion between electrons on plate and new electrons increases. So more work must be done to increase charge stored.
6Work done in charging up capacitorW=1/2 QV
Sub Q=CV
W=1/2 CV^2
Sub V=Q/C
W=1/2 Q^2/C
7Rules for capacitor connected in parallelC(total)=C1 + C2
p.d. across each is the same
total charge is =sum of individual charges
Q(total)=Q1+Q2
8Rules for capacitor connected in series1/C(total)=1/C1 +1/C2
total charge stored by each capacitor is the same
total p.d. V(total) is equal to sum of individual p.d.s V(total)=V1 +V2
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Descripción: A-Level (Capacitors) Physics Fichas sobre Capacitors, creado por Shpat Agushi el 30/01/2016.
Creado por: Shpat Agushi
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