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Capacitors (Capacitance Equation (d = distance between plates, C =…
Capacitors
Capacitance Equation
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ε0 = permittivity of free space,
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k = relative permittivity,
Basic Information
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The capacitance of an object is the amount of charge it is able to store per unit potential difference across it. C = Q/V
Discharging
When a capacitor is connected across a resistor, the pd drives a current through the circuit.
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Charging
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Method
Electrons flow from negative terminal to the plate connected, negative charge builds up
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These electrons are repelled by the negative charge on the negative plate and attracted to the positive terminal of the supply
The same number of electrons are repelled from the positive plate as are built up on the negative plate, this means an equal but opposite charge builds up on each plate causing the pd between plates
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