Potential Divider Equation (Rearranging)

AI Thread Summary
The discussion focuses on rearranging the potential divider equation, Vout = Vin x R2/(R1 + R2), to solve for R2. The user seeks assistance in isolating R2 while acknowledging they have successfully rearranged the formula for Vin and R1. A suggestion is made to multiply both sides by (R1 + R2) to facilitate the rearrangement. The importance of treating both sides of the equation equally is emphasized to maintain balance. The conversation remains centered on providing a clear method for solving for R2 in the context of given values for Vout, Vin, and R1.
rindishy
Messages
2
Reaction score
0
Member warned about use of template.
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)
 
Physics news on Phys.org
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.
 
Thread 'Voltmeter readings for this circuit with switches'

Thread 'Voltmeter readings for this circuit with switches'

TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance) My thoughts for the first case , one of them must be 12 volt while the other is 0 The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
View full post »
Thread 'Struggling to make relation between elastic force and height'

Thread 'Struggling to make relation between elastic force and height'

Hello guys this is what I tried so far. I used the UTS to calculate the force it needs when the rope tears. My idea was to make a relationship/ function that would give me the force depending on height. Yeah i couldnt find a way to solve it. I also thought about how I could use hooks law (how it was given to me in my script) with the thought of instead of having two part of a rope id have one singular rope from the middle to the top where I could find the difference in height. But the...
View full post »

Similar threads

Question about output voltages and impedances
Replies
5
Views
2K
Calculating Input Voltage for Switched Op-Amp Circuit
Replies
7
Views
1K
Finding Optimal Fixed Resistor for Potential Divider Circuit
Replies
45
Views
4K
Voltage drop and current through each resistor
Replies
3
Views
2K
Trouble rearranging this equation
Replies
2
Views
1K
Draw an electric circuit potential graph
Replies
5
Views
1K
Solve R1 in Rt = R3 + [ ( 1/R1 + 1/R2 ) ^-1 ] for Parallel Circuits
Replies
1
Views
3K
Calculating the current supplied battery, working out P.D....
Replies
6
Views
2K
Finding distance between two charges given their potential difference.
Replies
1
Views
3K
Finding the potential difference given two unknown points.
Replies
1
Views
2K

Hot Threads

Recent Insights

Back
Top