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Transcript
name_______________________ ID# ________________________ Experiment 6 Capacitive Reactance R _______________ C _______________ Vo _______________ approximate frequency (Hz) measured frequency capacitor voltage resistor voltage ___500____ __________ __________ __________ ___750___ __________ __________ __________ ___1000___ __________ __________ __________ ___2000___ __________ __________ __________ ___3000___ __________ __________ __________ ___4000___ __________ __________ __________ ___5000___ __________ __________ __________ ___6000___ __________ __________ _________ Analysis frequency theoretical reactance _________ __________ __________ _________ __________ __________ _________ __________ __________ _________ __________ __________ _________ __________ __________ _________ __________ __________ _________ __________ __________ _________ __________ __________ _________ __________ __________ VC VR experimental reactance V0 = VC2 + VR2 _________ __________ __________ _________ __________ __________ Equations and sample calculations: (10 points) Pick a frequency and add the magnitudes of the capacitor and resistor voltages. How does this compare to the generator voltage? This seems to contradict Kirchhoff's loop law. Why is this not the case? Questions 1. 1 Look at your table. Also, consider the equation XC = 2πfC . What happens to XC as the frequency gets very large? (2 points) 2. What will happen to the current in the circuit as the frequency gets real large? For (2 points) 3. You can see from your data that the resistor and capacitor voltages must be equal for some frequency. Set the resistance and the reactance equal to each other and solve for the frequency. Look at your data and decide if your answer is reasonable. (3 points) 4. What would the voltage across the resistor and capacitor be when the voltages are equal? (3 points)
