Please help

Just delete the voltmeter and put in you element of choice (e.g. a diode) and connect it like thw voltmeter. Does that help?

The question in my book is asking for v and i if the nonlinear element is a nonlinear resistor with i=0 for v<= Vt and i = .5k(v-Vt)^2, for V>=Vt, k = 0.5 mA/V^2, Vt = 3.5 V

78902580

put your book in the bin and go build the circuit instead

The question does not look right. Check it carefully again >= is mentioned twice and you can't have both in that setting.

I mean you can't have two inequalities there...I suspect that one there should just be an = on its own.

Greater than or equal to.

Even our calculator we got from school (which is about 140 € worth!) knows these symbols.

Yes ... Greater than, not = we can't make alterations once we have clicked these replies here and if the OP can't get back at all then I don't really see that our replies are doing much good for anything.

Karsten....stop being a smart ass else it's detention for you m'lad. ...and did you really mean 140 €

The question has both. However it is a lower case v for the first one and an uppercase for the 2nd V.

Welcome back....there are some points here which are hard to follow without seeing the whole question. We will try and help if you have the patience. Firstly:

1: Is that circuit diagram exactly as your book, or is it your own interpretation.....Ie: Is there a Voltage source given at any point other than that current source?

2: You could just put a variable resistor across the Voltmeter...you don't need to remove the meter. 3: there are different volt and current readings all over the circuit.....where is the V and the Vt and the i positioned which you are asked to find. 4: You are told what Vt is, so place that value in your formula along with anything else that you know...that will reduce the number of unknown terms to as few as possible. I think you have still missed the point that v cannot be less than or equal to something at the same time as being greater than or equal to something in that phrase. A revised presentation of the circuit along with the whole question would be best for further help.

It can be both, you forgot the equal part. v=Vt. V=Vt.

I didn't overlook that issue, I simply ignored it on the assumption that the book would not have used an upper and lower case V in the same phrase....That's partly why I suggested a revised show of the whole question.

2ctiby yes, is there anything wrong with that?