What is a capacitor?
A capacitor is a device that stores electrical charge.
It is made up of two conductive plates separated by an insulator or dielectric.
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What is the unit of capacitance?
The unit of capacitance is the farad (F).
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What is the formula that links capacitance (C), charge (Q) and potential difference (V)?
C = capacitance (F)
Q = charge (C)
V = potential difference (V)
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What is the formula linking capacitance (C), plate area (A), plate separation (d), permittivity of free space (ϵ0), and relative permittivity (ϵr)?
C = capacitance (F)
A = plate area (m2)
d = plate separation (m)
ϵ0 = permittivity of free space (F m-1)
ϵr = relative permittivity
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What happens to the capacitance if the area of the plates is increased?
If the area of the plates is increased, the capacitance also increases as more charge can be stored.
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What happens to the capacitance if the distance between the plates is increased?
If the distance between the plates is increased, the capacitance decreases as less charge can be stored.
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