Recent content by beanus

Homework Statement Homework Equations Not sure The Attempt at a Solution No idea how to even begin. I don't even know how to start this equation. My textbook has no examples of this type. Do I need to transform x(t)? If someone could simply steer me in the right direction...

That is the ground point that I set for it. I made this circuit in paint based on something I found in the book. I just wanted to do this problem for practice because it seemed difficult. Our book uses the black delta as ground.

Oh duh. Vr1 is just found by doing the regular node stuff the branch with r1. So that means the mesh equations are -30+V_is2+5i=0 20(i2-i1)+2(i2-i3-Vis2) = 0 (add the first two equations to cancel Vis2) 10i3+is4+2(i3-i2) = 0 10+20i4 = 0 is4 = 5(v1+10-30) Is that right?

2v1+5v1-250v1+960=0

So 10-30+iR1=0 i1(5)=20 i1=4 ?

I was trying to make the KVL equation like you said. But the Is2 is current so I have to multiply by a resistance to make it a voltage. I'm so confused right now. So my meshes are OK, it's just my constraint equation that I'm having trouble with? I am really trying to understand what...

so v1+10-30+5*i1+3(?)=0 Do I multiply by one since there's no resistor on that branch? v1+5i+3(?)=20

v2=v1+10 (v1+10-30)/5+v1/2-5(5*i1)=0 Is the current through the left branch equal to 3? So the second equation becomes (v1+10-30)/5+v1/2-75=0? Or is the current in the left branch equal to (v1+10)/5? or (v1+10)/5+3?

Still having trouble understanding the whole constraint thing, but this is what I've done. For the nodes v2=v1+10 (v1+10-30)/5-30=0 (v1)/2-5(5*i1)=0 For the meshes Is4=5(5*i1)

Ok I revised my node equations v2-v1=10 (v2-30)/5-3=0 v1/2-Is4=0 I'm not sure how to go about taking care of is4 in this case For the meshes, Everything ok was except mesh 3? This is what I got for the constraint: Is4=I2-I3. Thanks for the help !

Homework Statement Find the node voltage method equations. Do not solve Find the mesh current method equations. Do not solve Homework Equations NoneThe Attempt at a Solution Using nodal analysis: Node v1 : -Is4+(v1-v2)/2+v1/20-10=0 Node v2 : Is4+(v2-v1)/2+3+(v2-30)/5=0 Looking at this I feel...

Homework Statement A coil 3.55 cm radius, containing 480 turns, is placed in a uniform magnetic field that varies with time according to B = (1.20e-2 T/S)t + (3.05e-5 T/s^{4} )t^{4}. The coil is connected to a 620 Ohm resistor, and its plane is perpendicular to the magnetic field. You can...

So E=vB and {E}={v}cross{B} but if I have for instance v=5j and B=-1k, then E is in the positive i direction. Shouldn't it be in the negative direction? Thanks.

So am I right?

Homework Statement A 12.8 micro-F capacitor is connected through a 0.890 M-ohm resistor to a constant potential difference of 60.0 v. Homework Equations q=CE(1-e^(-t/(RC)) i=(E/R)-(q/(RC)) The Attempt at a Solution Compute the charge on the capacitor at the following times...