Capacitors

What's the formula for capacitance?
Capacitance C=Q/V
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If 150C flows through a circuit, what charge is on the plates?
If 150C flows, 150C is on the positive plate and -150C is on the negative plate.
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What are electrolytic capacitors?
Electrolytic capacitors increase capacitance with more charge on the positive plate. They can blow up.
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What are supercapacitors?
Supercapacitors are used for electronics and store charge. They charge in seconds and have less resistance.
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What's the formula for rate of change of charge?
dQ/dt=-Q/RC where R and C are constant. Change in charge is proportional to charge remaining.
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What are uses of capacitors?
Capacitors are used for cameras, car radio, defibrillators, and charging mobile devices.
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What's the formula for energy?
E=1/2 QV
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What's the formula for capacitance?
C = Eo * A/d
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How does capacitance add in series and parallel?
In parallel capacitance adds, in series it adds as resistors do in parallel.
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How do you charge a capacitor?
When charging a capacitor, close the switch and record PD regularly.
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What's the formula for discharging a resistor?
For a V-t graph, discharge of a resistor is exponential as charging for a capacitor would be. V=Voe^-t/T where T=RC
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What's the effect of greater resistance on capacitor discharge?
Greater resistance increases the time for discharge.
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How do charges move in a capacitor?
Charges flow to the negative and do work against repulsion before passing through the plates when the switch is open.
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Other cards in this set

Card 2

Front

If 150C flows through a circuit, what charge is on the plates?

Back

If 150C flows, 150C is on the positive plate and -150C is on the negative plate.

Card 3

Front

What are electrolytic capacitors?

Back

Preview of the front of card 3

Card 4

Front

What are supercapacitors?

Back

Preview of the front of card 4

Card 5

Front

What's the formula for rate of change of charge?

Back

Preview of the front of card 5
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