Lec19 - Lecture 19 Lecture 19-1 Examples of Mutual...

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Unformatted text preview: Lecture 19 Lecture 19-1 Examples of Mutual Induction Switch has been open for some time: Nothing happening Switch is just closed: EMF induced in Coil 2 +- Switch is just opened: EMF is induced again +- Alternatively, Coil on the left with current can move toward or away from the one on the right. A magnetic core can be inserted or removed. Lecture 19 Lecture 19-2 RL Circuits Starting Current 3. Solve this differential equation ( ) /(/) 1 tLR I e R = =L/R is the inductive time constant [ ] 2 2 / / / / Tm A Tm A LR s VA = = = dI IR L dt = 2. Loop Rule: 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 . +- /R /(/) tLR L dI V L e dt = = Lecture 19 Lecture 19-3 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 sinusoidallyoscillating...
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This note was uploaded on 04/07/2008 for the course PHYS 241 taught by Professor Wei during the Spring '08 term at Purdue.

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Lec19 - Lecture 19 Lecture 19-1 Examples of Mutual...

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