# Resonance - AAC ebook

Discussion in 'Electronics Resources' started by JStitzlein, Feb 24, 2011.

1. ### JStitzlein Thread Starter Member

Dec 6, 2010
53
0
Hi All,

If we assume that both components are subjected to a sudden application of voltage (say, from a momentarily connected battery), the capacitor will very quickly charge and the inductor will oppose change in current, leaving the capacitor in the charged state and the inductor in the discharged state

I'm confused why the cap can hold a charge while the inductor is discharged even if both are loads to the sudden pulse of battery source.

---EDIT
From what i've read, is it because the cap draws much more current, acting more of a "short"?

If the battery were kept there longer, charging both elements fully, would it just do nothing and not oscillate?

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Last edited: Feb 24, 2011
2. ### beenthere Retired Moderator

Apr 20, 2004
15,815
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The capacitor gets charged, but can't hold it once the battery is removed from circuit, as there is a discharge path through the inductor.

3. ### JStitzlein Thread Starter Member

Dec 6, 2010
53
0
Yes, but both elements are powered equally at the same time as a load.

4. ### Wendy Moderator

Mar 24, 2008
20,772
2,540
Caps charge fast, inductors don't. When you put a cap across power it acts like a dead short, surging several amps.

Coils on the other hand, resist current flow, in a mirror image to how caps act. When a coil is charge it is the one carrying several amps, but it takes time.

5. ### JStitzlein Thread Starter Member

Dec 6, 2010
53
0
This was my best guess, but i'm still curious to know what would happen if the battery were held there for a longer period of time. The cap would eventually charge, then the inductor would carry a magnetic field -

After the switch is released both elements would ideally hold their charge, but because of cap&inductive resistances, they would eventually lose charge.

I can't visualize what would happen next with both elements losing charge over time and supplying each other with energy, an oscillation with less amplitude?