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Lec 11 - (D P1019 Q7~\04 Fax\ku new\04-—H> Em 72.3...

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Unformatted text preview: (D P1019 Q7~ \04 Fax \ku new \04 -—H?> Em» 72.3: Mawanno “:27! NUDE VOLTAGE METHOD Special cases-with a voltage source directly between two nodes without a resistance in series {the current in the voltage source is not known) Case 1: One node is the reference node replace the node voltage equation {KCLJ at the "other" node with a voltage source equation Case 2: Reference node is not involved a. create a supernode h. write one KCL equation for the supernode c. write a voltage source equation relating the source voltage to the two node voltages Case 3: Circuit with several voltage sources without resistors in series see drill problem 3.9 E UATIUN LABEL "voltage source equation" Saw: L3: = LoBV \rz .-.- 19.93;on U’CQ =.Z-{Ll ( V Mallard EE 2H1 Spring EDGE: MWF 1o:oo — Homework: MAE? Page I of 2 % Homework: MAJ? % You may submit this Homework a total of It] times and receive full credit. View cumulative cumgleljm status This is similar to problem 3.29 in our textbook Thir question is adopted with pemissien‘fi'em rheptehifihenfiempmhlem 4.2? efem- rexrheek, Electric Cirem'rs. M'Lrsen and Ricard, 5H: edition. Addison-Wesley. £9.95: it is Emandedfor use by resisted students at Iowa State Unitrershy and may no: he usedjbr other purposes Mohair: the expressed pemu'sst'en of the prehiisher. Use the mesh-current method to find the branch currents in. 1.3. and ic in the circuit below where: V2 2 64 volts RI = 3 ohms R2 = 2 ohms R4 = 4 13111115 R5 = Li ohms R3 = 43 ohms 1. Find the values of Ihe mesh currents. i1 =i _ _ __ impCTCS. i2 =i I nmperes. 2. Find the values of the branch of currents. Note the: {fin and fl: have mine: close to each other med {fyeu compare it as me drfi‘hrence between these two mesh currents. then to get the fleet-tree} of 1": to within 2% qfrhe mine that Meliardwr‘fl compute. you will have re compute the value of the nee mesh cu rrenrs In severe-f sign-135mm figures. I iEl = |__ ._ l amperes. ih=|--- __ _ amperes. ic=| ___ __ _ _i tamper-es. Repeat the above calculations if the polarity of the 54 volt source is reversed. 3. Find the values of the mesh currents. hrtps:fieoeonfine.ee.iasteteedufEEEDispflBmwflwaebqu12.433iTSessionlD=kruen1peL11331:}... 2f? £21333 -.——_ ' — Mallard EE. 2G1 Spring RUDE-MW}: lfliflfl - Humawur}: MAJ? Page 2 0f? iI=| [amp-arc; i 12=| lampems. . 4. Find ti]: valuEs {if the branch nf'mlrrcnts. ia = I flmpgrcs. . . ' 9'9- —- _ a ngrse Maren-I'd! Copyright @ 159:3— Zflfl Iowa State Univarqity https:ffficc-unlinafiaiastaiesdufEEEfllspUSmwf lDIwabquiZJ; gi ?EE&5im1ID=kruBmpcl_1 (1311).. . EITHDUS 3.10 Use the node-voltage method to find 139 in the: circuit shown. BUD MESH CURRENT METHOD be — (ne — 1) equations 1. identify the meshes in the circuits (the "windows“) 2. define the mesh currents with direction (suggest they all be in the same direction) (CW) 3. KVL - sum voltage drags around the mesh (write the equations in terms of the mesh currents) 4. label each equation 5. the current in any branch may be a combination of mesh currents DHH 3H Mesh a t Mask 3 ‘. $o\u§~t}m '. 302.54— 6:00:3— L2) +503 -10: o 3'C‘”ZL2.z_'—§E_,5 =30 -zeL\+ 12%;, «mg =0 “52.x. ”C(OLZ‘F‘ZSLB =0 Maw-134.53%» = 22.5w QC: ( L'Z:Z'5A _Ww.w_wm~r_f__m,w_ ...
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