Electronic – LC circuit: can it act as an “AC battery”


I am curious about a resonant LC circuit. Assuming a perfect inductor and capacitor, would it be possible to tap off the energy in the oscillations to use it as a battery? Literally, it would be an AC battery. With a bridge rectifier and filter cap would this act as a DC battery?

(This is just theoretical stuff – I doubt you could get useful energy from an LC circuit as it would dissipate too quickly due to losses in the inductor and capacitor, plus to store any reasonable amount of energy would probably require a massive inductor and capacitor.)

Best Answer

This actually exists in RF transmitters like walkie-talkies. People call them "LC tanks." You're right that the amount of energy that can be stored is quite small. The reason people use them is to store energy that can be withdrawn as oscillations at a certain frequency.

You might Google "Colpitts oscillator" or "Hartley oscillator" for more information.