Potential Divider Equation (Rearranging)

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Homework Help Overview

The discussion revolves around rearranging the potential divider equation, specifically focusing on isolating the variable R2. The original poster is seeking assistance with this mathematical manipulation while expressing some difficulty with the underlying math concepts.

Discussion Character

  • Mathematical reasoning, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the need to rearrange the equation Vout = Vin x R2/(R1 + R2) to solve for R2, with some questioning the original poster's intentions and assumptions regarding the variables involved.

Discussion Status

The conversation is ongoing, with participants offering guidance on how to approach the rearrangement. There is a focus on maintaining the integrity of the equation while isolating R2, and some suggestions have been made regarding initial steps to take.

Contextual Notes

The original poster has indicated a lack of confidence in their math skills, which may influence their approach to the problem. There is also an emphasis on the importance of treating both sides of the equation equally during the rearrangement process.

rindishy
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Hi.

I'm currently learning about potential dividers and need some help with rearranging the formula.

I've managed to rearrange it to make Vin and R1 the subject, but I'm having trouble rearranging for R2.

Can someone help? My maths isn't great, so an explanation would be great. Thanks.

The formula is:

Vout = Vin x R2/(R1 + R2)
 
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What were you wanting from the rearrangement? You've omitted Vout. You can't be trying to eliminate it as a variable.
 
I want to be able to work out R2. So if for example I had a question where I was given Vout, Vin and R1, but not the value of resistance of R2.

i.e.

R2 =
 
Okay. Remember you HAVE to treat both sides of an equation the same way, whatever you do to one side, you do to the other; and you want R2 in terms of the other three variables. What's a good place to start? How about multiplying both sides by (R1+R2) and collecting terms containing R2 on one side of the equation? Take a stab at it and I'll be right here online for a while --- football games aren't on yet.
 

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