Personal understanding
1. Capacitors are not
blocks
hinder
(2) What is the loss of electrical energy, electrical energy converted to other forms of energy and can not be converted back to electrical energy, that is the loss, such as the resistance to convert electrical energy into heat dissipation called power loss, capacitors only temporarily stored electrical energy in the electric field, when needed at any time can be converted back.
3. I don't quite understand why the subject is obsessed with whether the capacitor is fully charged. Personally, I think that whether the capacitor is fully charged is a state, and the state is the result of the analysis process, which cannot be reversed for the analysis process. \"The reason to block the low frequency is that the capacitor may be full, so that the external circuit power off\" this statement is open to question, full charge and cause the break, this is already a nonlinear circuit, the capacitor is obviously not a nonlinear element, the break says that there is no current flow, the low frequency signal through the capacitor or there will be current, but it is very small. It is more appropriate to understand from the capacitor V-I relationship, when the capacitor C is certain, the higher the frequency, the greater the voltage change rate, the greater the current, indicating that the higher the frequency, the less likely to be \"hindered\" by the capacitor (compare the situation of resistance).