Lec19 - cture 19- cture 19- 1 RL Circuits – Starting...

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Unformatted text preview: cture 19- cture 19- 1 RL Circuits – Starting Current dI IR L dt ε - - = 2. Loop Rule: 3. Solve this differential equation ( 29 /( / ) 1 t L R I e R ε- =- τ=L/R is the inductive time constant [ ] 2 2 / / / / T m A T m A L R s V A × × = = = Ω 1. Switch to e at t=0 I = As the current tries to begin flowing , self-inductance induces back EMF , thus opposing the increase of I . +- ε/R /( / ) t L R L dI V L e dt ε- = = cture 19- cture 19- 2 Alternating Current (AC) = Electric current that changes direction periodically ac generator is a device which creates an ac emf/current. ac motor = ac generator run in “ reverse” A sinusoidally oscillating EMF is induced in a loop of wire that rotates in a uniform magnetic field. ( 29 cos cos B NBA NBA t θ ϖ δ Φ = = + ( 29 ( 29 sin B d NBA t dt ε ϖ ϖ δ Φ = - = + 2 2 f T π ϖ π = = where cture 19- cture 19- 3 ©2008 by W.H. Freeman and Company cture 19- cture 19- 4 READING QUIZ 1 \ Which of the following statements is correct ? A| In A.C. circuit with a A.C. generator and an ideal capacitor the current lags the voltage. B| In an A.C. circuit with a A.C. generator and an ideal inductor the current leads the voltage. C| In an circuit consists of an ideal inductor and an ideal capacitor....
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This note was uploaded on 12/07/2011 for the course PHYS 241 taught by Professor Wei during the Fall '08 term at Purdue.

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Lec19 - cture 19- cture 19- 1 RL Circuits – Starting...

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