Recall from Tuesday's lecture that an RL circuit can be compared to an Rc circuit.

Recall from Tuesday's lecture that an RL circuit can be compared to an Rc circuit.

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Physics 202 Thursday, April 15, 1999 Announcements: Lab Quiz next week on Ampere's Law. The lab cannot be purchased on the bookstore, but it can be downloaded from http://www.courses.psu.edu/phys/phys202_nxs16/sp99/ Lecture notes: Recall from Tuesday's lecture that an RL circuit can be compared to an Rc circuit. Note the similarity of an RL circuit with that of charging a capacitor. At t = 0 the switch is closed. ξ - iR - q/C = 0 - R dq/dt - q/C =0 o q = C ( 1 - e -t/ τ ) e The same procedure can be followed for an RL circuit = - L (di/dt) o Treat this as another emf, in the opposite direction of the emf due to the battery From Kirchhoff's Loop rule - iR - L di/dt = 0 Note that after a long time, t, di/dt= 0, so i = ξ /R o We can guess then, that i = ξ /R( 1- e -t/ τ L ) o What is τ L ? After solving for the two equations, - iR - L di/dt = 0 and i = ξ /R( 1- e -t/ τ L ), it can be determined that τ L = L/R
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Therefore, in an RL circuit,
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This note was uploaded on 02/21/2008 for the course PHYS 212 taught by Professor Mahlon,gregoryda during the Spring '07 term at Penn State.

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Recall from Tuesday's lecture that an RL circuit can be compared to an Rc circuit.

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