How your calculus ?  And were you looking for a mathematical treatment, or =
an intuitive treatment?

> I =3D C * dV/dT

That's the key definition.

For a "signal", V(t) =3D sum(X * sin (Y*t), (for various X and Y))
Y is linearly related to the frequency.

dV/dt (sin(Y*t)) =3D Y*cos(Y*t)

So the magnitude is dependent on the frequency.  Linearly, even...

BillW


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