20A_El_Reson

20A_El_Reson - INDIANA UNIVERSITY, DEPARTMENT OF PHYSICS,...

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Unformatted text preview: INDIANA UNIVERSITY, DEPARTMENT OF PHYSICS, P309 LABORATORY Laboratory #20A: Electrical Resonance Goal: Study the phenomenon of electrical resonance; know some of the conditions under which resonance occurs; quality factor Q Equipment: non-polar capacitor (0.001 µ F), inductance, several resistors, sine-wave generator, and oscilloscope. (A) Introduction A dramatic feature of ac circuits is resonance . Inductive reactance X L = ω L increases as the frequency is increased, but capacitive reactance X C = –1/ ω C decreases with higher frequencies. Because of these opposite characteristics, for any LC combination there is a frequency at which X L equals X C , as one increases and the other decreases. This case of equal is called resonance , and the circuit is then a resonant circuit . Figure 1: Series RLC circuit. For a series RLC circuit, as shown in Fig. 1, the total impedance Z , the phase angle ϕ , the current i , the output voltage V out and the gain G are: C j L j R Z ω ω − +...
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This note was uploaded on 01/20/2012 for the course P 309 taught by Professor Urheim during the Spring '11 term at Indiana.

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20A_El_Reson - INDIANA UNIVERSITY, DEPARTMENT OF PHYSICS,...

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