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 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 ξ - R dq/dt - q/C =0 o q = C ξ ( 1 - e -t/ τ ) e The same procedure can be followed for an RL circuit ξ = - 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 ξ - 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, ξ - 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, 1.
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• Spring '07
• MAHLON,GREGORYDA
• Physics, Magnetism, Magnetic Field, Electric charge, Inductor, LC circuit

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