Inductor and Capacitor Status in Circuits

[Zman]

Hello
If we have a circuit that uses an inductor and the voltage changed, the inductor should decline these changes with an increase or decrease in voltage at its' terminals.
If we have a circuit that uses a capacitor and voltage changed, what does the capacitor do?

and for a sin wave what is the effect?  and how do they work in this status with the sin wave?

[Jerome Trent]

The inductor you speak of stores energy in the form of a magnetic field.  If the voltage applied accross the inductor were to change, energy would be drawn from the magnetic field, or added to it, opposing that change in voltage.  If there was no further change in the voltage, the energy in the magnetic field and the voltage accross the inductor would stabalize to a constant.

The capacitor stores energy in the form of a voltage potential between its two plates.  If the voltage applied accross the capacitor were to change, energy would be drawn from the capacitor, or added to it, slowing the voltage change taking place.  Again, once the voltage is no longer changing, then the energy in the capacitor and the voltage accross it would stabalize to a constant.

Both of these devices store energy.  They just store it in different ways.  Then when there is a change, they react to that change.  Depending on what the change was, if the voltage increased then the energy stored in the device would increase.  If the voltage decreased then the energy stored in the device would decrease.