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Resonate: To vibrate at the resonant frequency or natural frequency. This
means that when excited by an external force, the system will vibrate at this
frequency. For example, if you hit a bell or tuning fork they vibrate at a
particular (resonant) frequency. In mechanical terms, it is the frequency where
very little force at at a frequency produces a very large amount of
displacement (Low impedance). I=F/v
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Encoder: transducer that converts displacement into an electrical signal
E=integral of power
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