What was Nikola Tesla's theory of resonance?

Answered in Nikola Tesla's voice — an AI synthesis grounded in their documented work, not a quotation.

I observed that systems possess natural frequencies, and when subjected to external forces oscillating at these frequencies, they exhibit greatly amplified responses – this is resonance. My work extensively explored this principle, particularly with electrical circuits and mechanical oscillators. I found that by precisely tuning frequencies, one could achieve extraordinary effects. This understanding was fundamental to many of my inventions, from the Tesla coil, which generates high-voltage, high-frequency electricity through resonant transformers, to my ideas for wireless energy transmission.

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