Hi

I am trying to answer a question where I need to use the general formula for a voltage divider to find the voltage in.

I have rearranged the general formula as follows:

Vout = Vin * Rother / Rtotal

Vin = Vout * Rtotal/ Rother

but i can't come to the correct answer, could someone please tell me if this is due to my rearranging being wrong?

Thanks...

 

Welcome to AAC!
Your rearrangement is correct.

 

Post a circuit diagram and show us which is Rother.

 

Hi

I am trying to answer a question where I need to use the general formula for a voltage divider to find the voltage in.

I have rearranged the general formula as follows:

Vout = Vin * Rother / Rtotal

Vin = Vout * Rtotal/ Rother

but i can't come to the correct answer, could someone please tell me if this is due to my rearranging being wrong?

Thanks...

I'm guessing that your problem is that you are using the wrong resistor when you say Rother.

An equation is meaningless unless it can be tied to a specific circuit layout. Draw a schematic that clearly shows where Vin in measured, where Vout is measured, what the resistors are and how the individual resistors relate to Rother and Rtotal.

 

I have rearranged the general formula as follows:

Vout = Vin * Rother / Rtotal

Vin = Vout * Rtotal/ Rother

but i can't come to the correct answer, could someone please tell me if this is due to my rearranging being wrong?

It would best for you to learn early that it's best to post a schematic when discussing a circuit; even one that seems (to you) to be simple.

A voltage divider doesn't necessarily need to be for two resistors.

We can tell that your arithmetic is correct, but we have no way of telling whether either equation is correct.

 

This is the circuit I'm working on, it's actually asking for the Thevenin equivalent voltage



Moderators note : showed image directly

 

Welcome to AAC!
Your rearrangement is correct.

Thanks

 

So, we can see the output voltage on your diagram, and the ? I guess is the input voltage. What do you think Rother and Rtotal are?

Bob

 

This is the circuit I'm working on, it's actually asking for the Thevenin equivalent voltage

Is there supposed to be something in the box with the 560k resistor? Are the circles (on the voltage source) meaningful?

Where's the voltage divider?

 

This is the circuit I'm working on, it's actually asking for the Thevenin equivalent voltage

Draw you circuit as a meaningful circuit. If the box is being modeled as a Thevenin equivalent, then draw the equivalent circuit, which is a voltage source in series with a resistance.

What is the box on the right that is labeled 53.48 μV? Is that a voltage source? Does it represent a voltmeter? What is the importance of the circle on top being open and the circle on the bottom being closed (filled in)?

In terms of this diagram, what you you saying that Rother and Rtotal are?

You need to communicate your work clearly and unambiguously. Not just here, but to whoever will be grading it, too.