Hey,
You have two independent variables here: the left loop current and the right loop current.
The current in the middle branch can be found using KCL.
All you have to do is writing down two KVL equations - one for the left loop and second for the right loop - and express all the voltages in each equation as a function of I_left_loop and I_right_loop.
No, but it is close. In this case, I am using LTSpice to solve a system of simultaneous equations. I didn't bother to force it to go the few extra steps to get beyond about three significant figures...
Thanks MikeMI. Btw, I have tried to apply in Multisim but fail. As I know Multisim only able to simulate each result in one time. How SPICE can get all the result in one time as attached?
Really wonder how?
Really need your expertise on this. Please advice.
Thanks MikeMI. Btw, I have tried to apply in Multisim but fail. As I know Multisim only able to simulate each result in one time. How SPICE can get all the result in one time as attached?
Really wonder how?
Really need your expertise on this. Please advice.
Two things about the sim. First, notice I asked Spice to do a ".DC: simulation, not time domain, not frequency domain, etc. This type of analysis is similar to what it does to find the bias point prior to doing either a time domain (.TRAN) or freq domain (.AC) analysis.
Second, LTSpice (not sure other flavors of Spice know how to do this) has a magic "Behavioral Current source" called B that lets you express it's current as a function of a whole bunch of things, including, in this example, the current through the other mesh. I'm using the Behaviorial current source to get the network to converge on an approximation of the solution to two equations in two unknowns.
If your sim does not have a Behavioral Current source, here is an alternate way of using a sim to solve it. Sweep the current source until you find a current that causes Error = 29*I(R1) - I(R3) = 0.
I'm using the "waveform arithmetic" of LTSpice to plot the Error function vs I1 (the independent variable being swept by the .DC statement). By finding the value of I1 that causes the error function to go to zero, we have found the answer, namely 1mA and 29mA as the mesh currents.
GilbertSam, you said this is an exercise. Is the point of the exercise to solve the circuit with simulation, or to solve it by using a network solution method, such as the loop or nodal method?
Thanks All. I manage to solve it algebraically but only wonder on how to simulate through the useful tool such as SPICE and Multisim. On learning stage....