a capacitor consists of two metal plates separated
by an insulating material.
a capacitor can store an electric charge, and that
its ability to store a charge (capacitance) depends upon the area of the
plates and their separation.
3d.3 Understand that capacitors block direct current
but allow alternating current to pass by continuously charging and
The effect described above of the current flowing
in a DC circuit until the plates are charged is used to effectively BLOCK
a DC current.
However, when an AC is applied to a capacitor then
the current continues to "apparently flow" due to the continuous charging
and discharging of the capacitor each cycle of the AC wave form.
larger values of capacitor may be polarised and must
be correctly connected.
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