Resonance happens when you push something at exactly the rhythm it naturally wants to move. Push a swing at the wrong time and you fight it. Push at the right time and the swing goes higher with each push — even though you're not pushing harder.
Electrical circuits do the same thing. Every circuit that has both inductance (a coil) and capacitance (a capacitor) has a natural frequency where energy sloshes back and forth between the magnetic field and the electric field. At that frequency, a small input produces a large response.
Why it matters for Open Energy
Resonance is one of the three elements of the meta-pattern found across 768 energy patents. 389 of those patents explicitly describe a resonance condition — making it the single most common design element in the dataset.
The hypothesis is that resonance allows energy to accumulate in a system rather than dissipating, and when combined with non-linearity and pulsed excitation, the system may exhibit behaviors that conventional steady-state analysis doesn't predict.
Everyday examples
- A wine glass shattering when a singer hits the right note
- A bridge swaying dangerously when soldiers march in step (which is why soldiers break step on bridges)
- A microwave oven heating food at 2.45 GHz — the resonant frequency of water molecules
- Tuning a radio to a station — you're adjusting an LC circuit to resonate at the broadcast frequency
In the experiments
The Bifilar Coil Resonance Characterization experiment directly measures resonance by sweeping a frequency range and finding where a coil's impedance peaks. The Electrolytic Cell Resonance experiment does the same thing with a water cell instead of a coil.
Going deeper
- Self-Resonant Frequency — the specific frequency where a component resonates due to its own parasitic properties
- Q Factor — how "sharp" the resonance is (high Q = energy stays in the system longer)
- LC Circuit — the simplest resonant circuit: one inductor + one capacitor