multisim - How do you create resistors without knowing the resistance?

[BeaglyBeagle]

hey everyone, I have the following circuit (attached to the post).

How would you go about creating this in Multisim? I can't seem to find a way that allows me to create resistors where the resistance is unknown, while the voltage is known (current is also unknown, so there doesn't appear to be an easy way to calculate that).

Thanks! 🙂

[johnsold]

How would you solve that problem manually? A circuit simulation progam just relieves you of many tedious calculations. It cannot create information.

The circuit you posted appears to be an illustration of Kirchoff's voltage law but does no have enough information to determine resistances or currents.

To answer the question in subject line: You should be able to do that using a circuit including controlled sources. Given the current-voltage relationship, it is possible to create a circuit which measures the current entering a device and then to set the voltage across the terminals of that device.

Lynn

[leo.ni]

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BeaglyBeagle escreveu:

hey everyone, I have the following circuit (attached to the post).

How would you go about creating this in Multisim? I can't seem to find a way that allows me to create resistors where the resistance is unknown, while the voltage is known (current is also unknown, so there doesn't appear to be an easy way to calculate that).

Thanks! 🙂

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Hi, BeaglyBeagle

There's no such way you could do that on Multisim, or even on other circuit simulation programs. Because you just put the components and their respective values on Multisim and then the software does all the calculations for you, just like johnsold answered.

But, for me, I understood that your question is about putting values for some resistors and voltage sources (like the picture you provided) and hence, calculate the current of the circuit.

If that was this case, you can use LabVIEW to put these values. I have made a really simple VI to represent this situation. Note that the controls are in SI notation.