How to find the vo in terms of v1 and v2?

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In summary, the conversation discusses a problem with finding the voltage between a 100k resistor and a 200k resistor, and whether or not the voltage at that point is zero. The possibility of using KCL equations to solve the problem is also mentioned. The conversation ends with a question about the voltage difference between the + and - inputs of an ideal opamp with negative feedback. The concept of "virtual ground" is suggested as a possible solution.
  • #1
haha1234
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Homework Statement


The problem is upload below.

Homework Equations

The Attempt at a Solution


I was stuck at finding the voltage between the 100k resistor and 200k resistor.
Is the voltage zero since the node below there is zero and there is no resistor between them?
But if the node voltage is zero,there will be no current going through that path which I think is quite strange...:sorry:
 

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  • #2
haha1234 said:

Homework Statement


The problem is upload below.

Homework Equations

The Attempt at a Solution


I was stuck at finding the voltage between the 100k resistor and 200k resistor.
Is the voltage zero since the node below there is zero and there is no resistor between them?
But if the node voltage is zero,there will be no current going through that path which I think is quite strange...:sorry:
For an ideal opamp with negative feedback, what can you say about the voltage difference between the + and - inputs?

I would solve this using KCL equations. Write the 3 KCL equations for the following nodes: - input of opamp, output of opamp, Vo node... :smile:
 
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  • #3
haha1234 said:
Is the voltage zero since the node below there is zero and there is no resistor between them?

Which node do you mean by "the node below there"?

Perhaps see if "virtual Ground" is in your textbook.
 

What is the formula for finding VO in terms of V1 and V2?

The formula for finding VO in terms of V1 and V2 is VO = V1 + V2.

Can VO be negative?

Yes, VO can be negative if V1 and V2 are both negative or if V1 is larger than V2.

Is there a way to simplify the equation for finding VO in terms of V1 and V2?

Yes, the equation can be simplified to VO = V1 - V2 if V2 is subtracted from both sides.

What is the unit of measurement for VO?

The unit of measurement for VO is the same as V1 and V2, which could be volts (V), meters per second (m/s), or any other unit of measurement for velocity.

Can VO be greater than V1 or V2?

Yes, VO can be greater than V1 or V2 if the two values have opposite signs and their absolute values are not equal. For example, VO could be 5 if V1 is 3 and V2 is -2.

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