In sci.astro George Dishman wrote:

The key difference is that in an LC circuit, energy can
be stored in the magnetic field in the inductor and in the
electric field in the capacitor. The collapse of the
magnetic field induces a voltages that charges the
capacitor, the voltage across the capacitor then builds
the current in the inductor in the opposite sense to the
original and so on. Without resistive losses this could
go on indefinitely.

With just an RC, the energy in the capacitor is turned
into heat in the resistor and that is the end.

of course the "R" in the RC isn't a requirement. The whole
key to oscillations (resonance) is time. Any feedback
system can become unstable and have oscillations if the
timing is right. The key is to have a positive feedback
situtation. It's just another way to describe a resonant
system. The essence of the resonance has to do with
shifts in time.

Bjacoby
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