zhang21-2

# zhang21-2 - The impedance of a RLC circuit is Z R2 X L X...

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2/23/2010 1 Frequency Reactance (X L ) The impedance of a RLC circuit is 2 2 ) ( C L X X R Z fL X L 2 fC X C 2 1 There is always a frequency at which therefore the total impedance is minimized L C X X 0) phase ( ) ( 2 2 min R X X R Z C L At this frequency, the current in the circuit will reach its maximum value This frequency is called resonance frequency ( f 0 ) of a RLC circuit R V I rms rms L f C f o o 2 2 1 LC f o 2 2 4 1 LC f o 2 1

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2/23/2010 2 “Unfortunately”, everything is digital nowadays … Adjustable capacitor Inductor Inductor Adjustable capacitor Tuning a radio A varying capacitor changes the resonance frequency of the tuning circuit in your radio to match the station to be received Metal Detector The portal is an inductor, and the frequency is set to a resonance frequency with no metal present When metal is present, it changes the effective inductance, - out of resonance The change in current is detected and an alarm sounds
2/23/2010 3 Which of the following statement is true for a RLC in resonance? (1) Impedance reach its minimum value (2) Phase shift between i and v is zero (3) Frequency of the AC source is (4) All of the above LC 2 1 Transformer is everywhere Adapters Electric power transformer Inside a transformer

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zhang21-2 - The impedance of a RLC circuit is Z R2 X L X...

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