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    Linear algebra

    anyone???
  2. S

    Linear algebra

    i don't know what i should do now? we don't know anything about w. I the book it said that examine det(A^T A) colonnvektors in A are u,v,w.
  3. S

    Linear algebra

    [u, v] = pi / 4 [u, v] is not pi/2 i said someting in the book about det(A^T A)
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    Linear algebra

    Homework Statement Unit cell of a crystal lattice is a parallelepiped spanned by the vectors u, v, w vectors have lengths of 1, 2 resp3 (le). angles between the vectors is [u, v] = pi / 4 [u, w] = pi / 3 [v, w] = pi / 6 Determine the volume of the unit cell. Homework Equations How do...
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    Ideal source

    but when the output voltage across a load is independent of the load they say in the book that out but acts as a ideal voltage source. and that the output impedance =0 (can someone explain why it shoulde be 0) and if it is zero then is is same as the diagram 1 I am talking about op Amp.
  6. S

    Ideal source

    forgot the picture
  7. S

    Ideal source

    Homework Statement Homework Equations Is 1 an ideal voltage source? Is 2 and ideal current source? i was solving a noninverting amplifier circuit and i was asked to find out output impedence. and in the first circuit output voltage was independent of the load resistence => output...
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    Engineering Non amplifiing circuit (OP)

    i just want to know why the get Rin =0 because WesleyPipes said i=v/R I=0 if R=--->infinity or if v=0 we know that v is zero but R can't be zero
  9. S

    Engineering Non amplifiing circuit (OP)

    http://www.eit.lth.se/fileadmin/eit/courses/etia01/hambleysolutions4th/Chapter_14.pdf p 14 32 page 25 it says that Rin=0 but shouldn't it be infinity because current going in to the op amp node =0. it is not the same question.
  10. S

    Engineering Non amplifiing circuit (OP)

    And one more question in an amplifing circuit is the input impedance =0 or is is it infinity or does it depend on the other facts. We have a voltage source directy connected to + or - on the amp but it woulden't be op-amp's inputs is = V1. for noninvering amp because R1 doen't exist in non...
  11. S

    Engineering Non amplifiing circuit (OP)

    is there any way to show that How about noninvering amp? But then should i use KVL at amp node=
  12. S

    Engineering Non amplifiing circuit (OP)

    what do u meen with use Use the voltage one? i tried using kvl on all the loops but coudn't solve. current goin in to the + on the amp =0 and voltage is 0 between + and - on the amp. summing point constraint.
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    Engineering Non amplifiing circuit (OP)

    Homework Statement Analyze the ideal op-amp circuit shown in figure to find an expression for v0 in terms of vA,vB and the resistance values. Homework Equations if i label the voltage across R1 as V1 then vi know that v1=R1/(R1+R2) *v0 but i need one more expression for v1. i tried...
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    Solve Vx using Superposition

    So i shoudn't use superpostion in this case. What do u meen by if you leave the dependent source in the circuit you end up with two nodes to deal with, at the points with the V1 and V2 labels. Write KCL for both nodes. You'll end up with two equations in two unknowns. Solve for the one you...
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    Solve Vx using Superposition

    2,5 in the first one and 10 in the second one total 12,5 V Thanks Gneill. Now i have a another problem that i need som help with. My teacher told me that i can zero the dependent source in this problem and the result that i got was correct but according to book and websites you cant zero...
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    Solve Vx using Superposition

    KCL Picture 1 Current source=zero KCL at node Vx in the diagram. -0,1Vx+0,25Vx+(Vx-10)/20=0 (Vx in this equation is Vx1 as gneill said) Kcl picture 2 voltage source=zero Kcl -2-0,1Vx+0,25Vx+Vx/20=0 (Vx in this equation is Vx2) I havent done any problem with dependent source using...
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    Solve Vx using Superposition

    Can you show me the KCL for the voltage supply so i know how to do the same for current. I have written KCL as are saying but i coudn't solve for Vx
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    Solve Vx using Superposition

    Homework Statement http://img16.imageshack.us/img16/8901/circuit1s.png [Broken] Homework Equations I need som help with this circuitI need to use superposition to find out the value of Vx. And to do that i need to zero the current source and voltage source The Attempt at a...
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