0 calculation calculation

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Unformatted text preview: c IXL IXc 10 0 Preflight 10 IXL ε IR 50 IR A B C IXc BB BB 40 IXc ε 30 20 10 IXL What does the voltage phasor diagram look like when the capacitor is fully charged? 0 Preflight 12 IXL ε IR 60 IR A B C IXc BB BB 50 40 IXc ε 30 20 10 IXL What does the voltage phasor diagram look like when the voltage across capacitor is at its positive maximum? 0 Calculation Calculation Consider the harmonically driven series LCR circuit shown. Vmax = 100 V Imax = 2 mA VCmax = 113 V The current leads generator voltage by 45o L and R are unknown. C V~ L R What is XL, the reactance of the inductor, at this frequency? • Conceptual Analysis – – The maximum voltage for each component is related to its reactance and to the maximum current. The impedance triangle determines the relationship between the maximum voltages for the components • Strategic Analysis – – – Use Vmax and Imax to determine Z Use impedance triangle to determine R Use VCmax and impedance triangle to determine XL Calculation Calculation C Consider the harmonically driven series LCR circuit shown. Vmax = 100 V Imax = 2 mA VCmax = 113 V The current leads generator voltage by 45o L and R are unknown. V~ L R What is XL, the reactance of the inductor, at this frequency? Compare XL and XC at this frequency: (A) XL < XC (B) XL = XC (C) XL > XC (D) Not enough information BB • This information is determined from the phase – Current leads voltage IR 45ο VL VL = ImaxXL VC = ImaxXC VR (phase of current) V VC lea...
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This document was uploaded on 02/13/2014.

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