The capacitance of an object where one coulomb of charge stores one volt of potential difference
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What is the equation that links Charge, Voltage and Capacitance?
Q = VC
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What is the structure of a capacitor?
2 conducting plates separated by an insulator
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What is the name of the insulator in a capacitor?
Dielectric
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What is "dielectric breakdown"?
Where the charge in a capacitor becomes too much and the p.d. too great, the current will leap through the insulator, an example of this is lightning striking the earth
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How do capacitors interact in circuits in terms of their capacitance?
Sums in parallel, 1/total sum of 1/C1 + 1/C2...
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What is an electric field?
An electric field is a region where any charged particle will experience a force
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Where do you find electric fields?
Around any charged object
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What causes an object to become charged?
An imbalance of positive and negative charges within it, usually protons and electrons
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How do you draw electric fields, what are the standards?
-Represented by radial arrows -Closer arrows mean stronger fields -Arrows are drawn in the direction that a positive charge would move in that field -Arrows are drawn at 90° to the surface of conductor (?)
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What is the equation for the force that a particle experiences in an electric field?
F = EQ, where F is force, E is electric field strength, and Q is charge
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What is the equation for the force that 2 charges experience when within each others electric field?
F = (k x Q1 x Q2) / r^2
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What is r in the previous equation?
r = radius, ie, distance between 2 charges
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What is k in the previous equation?
k = 1/(4π x ε) where ε is the permitivity of free space (a vacuum)
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Knowing this how could you rewrite the equation for force experienced by 2 charges near each other?
(1 / (4π x ε)) x ((Q1 x Q2)/ r^2)
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Other cards in this set
Card 2
Front
Define the Farad
Back
The capacitance of an object where one coulomb of charge stores one volt of potential difference
Card 3
Front
What is the equation that links Charge, Voltage and Capacitance?
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