# Physics Unit 4 - Capacitors

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How does a capacitor work?
2 parallel plates, electrons travel to 1 plate, giving it a - charge.That - charge will repel the - charge on the other plate, that charge will go to the + side of the battery, leaving a + charge on the other plate
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What is the insulating material between the 2 parallel plates?
Dielectric
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What is capacitance measured in?
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What does the capacitance depend on?
Area of the plates, Separation between the plates, Nature of the insulator between them
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How does a capacitor charge/discharge?
Exponentially
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What does the time constant tell us?
How many seconds it takes for the capacitor to fall to 37% of its starting value
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What factors will take longer for the capacitor to charge?
Greater resistance, larger capacitance
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How do you add capacitors in parallel?
Ct = C1 + C2 ...
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How do you add capacitors in series?
1/Ct = 1/C1 + 1/C2 ...
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What is the equation linking the permivitty of free space, area and seperation?
C = EoA/d
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## Other cards in this set

### Card 2

#### Front

What is the insulating material between the 2 parallel plates?

Dielectric

### Card 3

#### Front

What is capacitance measured in?

### Card 4

#### Front

What does the capacitance depend on?

### Card 5

#### Front

How does a capacitor charge/discharge?