Author Topic: potential divider  (Read 558 times)

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Offline ramakrishnaTopic starter

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potential divider
« on: August 08, 2020, 02:49:02 pm »
potential divider query, the R1(30K) and R2(20K) using in potential divider circuit, input is giving pulse signal from +3V to 0V from R1 one end,
from R2 end feeding -5V supply, so what is the output across R2? and give me the formula or equation to calculate these types of two input to potential divider.
 

Online Ian.M

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Re: potential divider
« Reply #1 on: August 08, 2020, 03:14:31 pm »
It depends how formal a solution you need:

For a back of the envelope calculation, as one of your sources is fixed -5V, you can simply take all voltages with respect to that point, (i.e. treat the other source as pulsing from +8V to +5V), and use the usual potential divider formulae to solve it for the two voltage levels of the pulse.  If you need the result referred to your original 0V point (rather than across R2), you'd then need to subtract 5V.

More formally, you could use Superposition and Thévenin's theorem

However if you are a university student, unless you have explicitly been told otherwise, the instructor is probably looking for a solution based on Nodal or Mesh analysis.

The numerical results for all methods applied to this circuit *are* equal, so if you solve it by more than one method and yours are different you've made a mistake.
« Last Edit: August 08, 2020, 04:38:39 pm by Ian.M »
 

Online SiliconWizard

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Re: potential divider
« Reply #2 on: August 08, 2020, 03:22:59 pm »
A simple, two-resistor divider is pretty easy to analyze and the potential of the middle point can be basically expressed as a barycenter (centroid).

That should be more than enough answer here - as Ian.M said, if this is a school assignment, better try and do it by yourself.
If the fact the "other end" of the divider is not at 0V (ground) potential - for which you would maybe have the answer - but at some other potential, then it would clearly show you didn't quite grasp this simple circuit, which would show that it'd definitely be an exercise you'd need to work on!
 
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