AcousticsA response across the air.
Strike one tuning fork and another, suitably arranged and tuned to the same frequency, can begin to sound. Energy travels through the air. The response depends on the source, the receiver, and the conditions connecting them.4
ElectricityA signal worth receiving.
Early wireless engineers tuned circuits so a receiver would respond strongly to the intended transmission. Electrical resonance helped turn a field of signals into useful communication.2
EngineeringAmplification needs judgment.
Near resonance, a modest periodic input can produce a large response. Engineers use this behavior where it helps and control it where it harms. Damping changes what a system amplifies.5