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28 Terms
1
What does a capacitor measure and what does it consist of
Measures: Capacitance, the ability to store electrical charge. Consists of: Two conductive plates separated by an insulating material, known as a dielectric.
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2
Relationship between area and capacitance
As area increases, capacitance increases
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3
Relationship between distance and capacitance
As distance increase, capacitance decreases
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4
Relationship between dielectric constant k, capacitance, voltage and charge
As k increases, capacitance increase, voltage decrease, charge stays the same
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5
Derive equation for capacitance of an isolated sphere
area = a, assume V=0 for infinitely large space .
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6
Is the capacitance of an isolated sphere dependent on charge or the potential?
No, only on the area
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7
Derive equation for cylindrical capacitor
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8
Capacitance of spherical conductor
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9
When does the flow of charges cease in a capacitor circuit?
The flow of charges ceases when the voltage across the capacitors equals that of the battery.
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10
Potential difference across capacitors in parallel circuit
The potential difference across the capacitors is the same. Each is equal to the voltage of the battery.
ΔV1 = ΔV2 = ΔV.
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11
When do capacitors reach their maximum charge?
when the flow of charge ceases
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12
Qtotal in parallel circuit
The total charge is equal to the sum of the charges on the capacitors. Qtot = Q1 + Q2.
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13
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14
Equivalent capacitance in a parallel combination
Ceq = C1 + C2 + C3 + ...
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15
Capacitor charges in a seriescombination
The charges are all the same. Q1 = Q2 = Q.
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16
Voltage addition in a parallel combination
ΔVtot = ΔV1 + ΔV2 + …
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17
Equivalent capacitance in a series combination
The equivalent capacitance is 1/Ceq = 1/C1 + 1/C2 + ...
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18
The equivalent capacitance in a series combination of capacitors is _______ than any individual capacitor.
less
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19
The potential differences across capacitors in series _______ up to the battery voltage.
add
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20
What is the same across all capacitors in parallel circuit
Voltage
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21
What is the same across all capacitors in series circuit
Charge
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22
Work needed to transfer a charge from one plate to another
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23
Work done for charging a capacitor
It is the electric potential energy U
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24
Relationship between energy stored, charge and potential difference
The energy stored increases as the charge increases and as the potential difference increases
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25
Energy for parallel-plate capacitor expressed in terms of field
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26
Energy in terms of charge density
\
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27
Energy stored in a parallel-plate capacitor before inserting a dielectric
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28
Energy stored in a parallel-plate capacitor after inserting a dielectric
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