156 lab 6

# 156 lab 6 - LAB 6 ALTERNATING CURRENT CIRCUITS PHY 156...

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LAB # 6 ALTERNATING CURRENT CIRCUITS PHY 156 Object of the Experiment and Theoretical Background

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The object of this experiment is to determine the effective value of the current, rms current, in an RCL circuit. Also the resonance frequency and phase relationships for instantaneous voltages in the series RLC circuit are to be studied. The effective value of the current is given by: I rms = V rms = V R² + ωL – 1 Z ωC The voltage across the resistor, inductor and capacitor has a different amplitude and phase as can be seen in our graph 1. The voltage across the resistor is in phase with the current, the voltage across the inductor leads the current by 90º, and the voltage across the capacitor lags behind the current by 90º. These phase relationships are useful to calculate the instantaneous voltages across each component of the RLC circuit: ΔV R = I max . R . sin(ωt) = ΔV R . sin(ωt) ΔV L = I max . X L . sin(ωt + π/2) = ΔV L . cos(ωt) ΔV C = I max . X C . sin(ωt - π/2) = -ΔV
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156 lab 6 - LAB 6 ALTERNATING CURRENT CIRCUITS PHY 156...

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