I understand that capacitors will charge until it’s “full” and voltage and current = 0 because no more electrons can go through. In AC circuits, capacitors will charge and discharge according to the ups and downs of the sin graph. But how does this filter noise?
Noise being different frequencies than the sin wave that we want?
In: Physics
Capacitor impedance (frequency dependant resistance) is 1/jwC
j is imaginary number (same as i but gets confusing since i is also used for current variable)
w is 2*pi*frequency
C is capacitance of the capacitor
For DC, frequency is 0 so the impedance of a capacitor is infinite….a wall.. no current flow.
For AC, frequency is nonzero and has some impedance that depends on frequency but isn’t so high that no current flows
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