Potential Dividers [Not Finished]

[frenulem - No.5417]

Please read and understand this first
Potential Dividers divide the potential or the voltage, same thing but we will call it voltage here just for ease, the basic things you would use this for are sensors, because you can use this to switch a transistor.

so you can use it to sense:
     

• Hot
• Cold
• Light
• Dark
• So many other things

also any combination if you wire it correctly, so if you put an LDR at point A, and Thermistors at B and C you could say, when its dark at A, Cold at B and warm at C something will happen.

But I digress, lets get down to the meat of Potential Dividers.



The main calculation for Potential Dividers is:

              R₂       
V_out = ^_________  X V_s
           R₁ + R₂

The picture shown is the most basic potential divider you can produce, simply two resistors in series.

So some examples for you.
If:
V_out = 4.5V
R₁ = 10K
R₂ = 10K
V_s = 9V
             10K       
4.5V = ^_________  X 9V
         10K + 10K

Or:

V_out = 6V
R₁ = 10K
R₂ = 20K
V_s = 9V
             10K       
6V = ^_________  X 9V
         10K + 20K