Basic RL and RC Circuits RL TRANSIENTS: STORAGE CYCLE. Engineering Collage Electrical Engineering Dep. Dr. Ibrahim Aljubouri


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1 st Class Basic RL and RC Circuits The RL circuit with D.C (steady state) The inductor is short time at Calculate the inductor current for circuits shown below. I L E R A I L E R R 3 R R 3 I L I L R 3 R R 3 RL TRANSIENTS: STORAGE CYCLE E t R L at And, therefore
2 st Class ( ) Find the mathematical expression for the transient behaviour of and. KΩ t v v L i L 4H ( ) ( )
3 st Class For the circuit shown below, calculate the mathematical expression of before and after the storage phase has been complete ant the switch is open. switch on ( ) ( ) ( ) switch off After the storage phase has passed and steadystate conditions are established, the switch can be opened without the sparking effect or rapid discharge due to the resistor R, which provides a complete path for the current i L. The voltage v across the inductor will reverse polarity and have a magnitude determined by ( ) ( )
4 st Class The Source Free RL circuit i R L Using KVL, leads This equation represents a differential equation and can be solved by several different methods Since the current is at and at time t, we may equate the two definite integrals with are obtained by integrating each side between the corresponding limits If the inductor has a current A at t=0, find an expression for valid for, and its value at t=00µs. 00 Ω 0 mh At t=00µs 3 4 A ( ) ma THÉVENIN EQUIVALENT: For the network of Figure below a. Find the mathematical expression for the transient behavior of the current il and the voltage vl after the closing of the switch (Ii =0 ma). b. Draw the resultant waveform for each. 4
5 st Class Solutions: a. Applying Thévenin s theorem to the 80mH inductor,yields (4 6) (4 6) Applying the voltage divider rule to determine Thevinen voltage (4 6) 6 (4 6) ( 8 6 ) 6 3 ( ) 6 Find the voltage across 40Ω resistor at t=00ms. 0 Ω 40 Ω t=0 4V H
6 st Class 4 At t= Determine both and for mh 0 Ω t=0 i i L 80 Ω 90 Ω mh 3mH 8V H.W The switch S of following Figure has been closed for a long time. At t = 0 s, S is opened at the same instant S is closed to avoid an interruption in current through the coil. a. Find the initial current through the coil. Pay particular attention to its direction. b. Find the mathematical expression for the current i L following the closing of the switch S. c. Sketch the waveform for i L. 6
7 st Class RC Circuits Find the voltage across and charge on capacitor C of Figure below after it has charged up to its final value. Solution : the capacitor is effectively an open circuit for dc after charging up to its final value Find the voltage across and charge on each capacitor of the network of Figure below after each has charged up to its final value. Solution ENERGY STORED BY A CAPACITOR The ideal capacitor does not dissipate any of the energy supplied to it. It stores the energy in the form of an electric field between the conducting surfaces. TRANSIENTS IN CAPACITIVE NETWORKS: CHARGING PHASE 7
8 st Class At t=0,, therefore And RLC Circuits Find the current I L and the voltage V C for the network Solution: 8
9 st Class 3 6 H.W Find the currents I and I and the voltages V and V for the network 9
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