Chapter 21- Flashcards

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1
Q

What is a capacitor

A

It is an electrical component in which charge is separated.

It has two metal plates separated by an insulator

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2
Q

Definition of capacitance

A

The charge stored per unit p.d

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3
Q

Equation of capacitance

A

Q = VC

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4
Q

Capacitance in Parallel

A

P.d across capacitors is the same.
Electrical charge is conserved - Sum across each charge
Total capacitance is sum of individual capacitors/

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5
Q

Capacitors in Series

A

P.d is sum of individual p.d’s
Charge is same across each capacitor
Total capacitane is 1/ capacitance

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6
Q

What directions does an electron flow in a capacitor

A

From the negative to positive plate

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7
Q

What does the area under a graph represent

A

Work Done

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8
Q

What is the work done equation

A

W = VQ

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9
Q

What is the equation for energy stored

A

W = 1/2 QV

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10
Q

What are the other two equations for energy stored

A
W = 1/2 V^2 C
W = 1/2 Q^2 / C
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11
Q

What is the time constant of a capacitor

A

tau = CR

V /e x 0.37

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