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from which formula we select a capacitor rating?
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Answer Posted / dhinakaran.s
capacitance is the ability of a body to hold an electrical
charge. Capacitance is also a measure of the amount of
electrical energy stored (or separated) for a given
electric potential.
Capacitance is given by C = Q/V farad.
The SI unit of capacitance is the farad; 1 farad is 1
coulomb per volt.
In parallel plate capacitor,
C=εA/d farad.
where
ε=ε0*εr
C is the capacitance;
A is the area of overlap of the two plates;
εr is the relative static permittivity (sometimes called
the dielectric constant) of the material between the plates
(for a vacuum, εr = 1);
ε0 is the electric constant (ε0 ≈ 8.854×10−12 F m–1); and
d is the separation between the plates.
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