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1. Coupling and reciprocity
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A reminder of oscillators
Consider the series combination of three passive elements (R resistor, L inductor and C capacitor). The relationship between the voltage u (t ) across this circuit and the current i (t ) through it can be written as a second-order differential equation with constant coefficients:
If the imposed voltage is harmonic, the current will also be harmonic, and the above equation can be expressed using complex quantities...
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