What is RESONANCE

Chapter 6 RESONANCE

Lessons In Electric Circuits Volume II – AC Book
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Lessons In Electric Circuits Volume II – AC Book

  • Chapter 6RESONANCEContents 128,6.1 128,An 128,electric 128,pendulum . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119 133,6.2 133,Simple 133,parallel 133,(tank 133,circuit) 133,resonance . . . . . . . . . . . . . . . . . 124 138,6.3 138,Simple 138,series 138,resonance . . . . . . . . . . . . . . . . . . . . . . . . . . . 129 142,6.4 142,Applications 142,of 142,resonance . . . . . . . . . . . . . . . . . . . . . . . . . . 133 143,6.5 143,Resonance 143,in 143,series-parallel 143,circuits . . . . . . . . . . . . . . . . . . . . 134 152,6.6 152,Q 152,and 152,bandwidth 152,of 152,a 152,resonant 152,circuit . . . . . . . . . . . . . . . . . . 143 153,6.6.1 153,Series 153,resonant 153,circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144 155,6.6.2 155,Parallel 155,resonant 155,circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . 146 158,6.7 158,Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1496.1An electric pendulumCapacitors store energy in the form of an electric field, and electrically manifest that stored energyas a potential: static voltage. Inductors store energy in the form of a magnetic field, and electricallymanifest that stored energy as a kinetic motion of electrons: current. Capacitors and inductors areflip-sides of the same reactive coin, storing and releasing energy in complementary modes. Whenthese two types of reactive components are directly connected together, their complementary ten-dencies to store energy will produce an unusual result.If either the capacitor or inductor starts out in a charged state, the two components will exchangeenergy between them, back and forth, creating their own AC voltage and current cycles. If we assumethat both components are subjected to a sudden application of voltage (say, from a momentarilyconnected battery), the capacitor will very quickly charge and the inductor will oppose changein current, leaving the capacitor in the charged state and the inductor in the discharged state:(Figure 129,6.1)The capacitor will begin to discharge, its voltage decreasing. Meanwhile, the inductor will beginto build up a “charge” in the form of a magnetic field as current increases in the circuit: (Figure 129,6.2)119