What is the theory behind voltage dividers and current dividers?

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Discussion Overview

The discussion revolves around the theory and application of voltage dividers and current dividers in electrical circuits, particularly in the context of operational amplifiers. Participants seek to understand the underlying principles and equations associated with these concepts.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant asks about the role of voltage dividers in circuits, specifically in operational amplifier configurations, and mentions the equation involving resistances R3 and R4.
  • Another participant explains that by selecting appropriate values for R3 and R4, the voltage at the non-inverting input of the op-amp can be set to a desired fraction of the input voltage V2, detailing the relationship between current and voltage across the resistors.
  • A third participant suggests a reference text, "The Art of Electronics" by Horowitz and Hill, as a resource for further understanding.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the theoretical aspects of voltage and current dividers, and the discussion includes various viewpoints and explanations without resolution of disagreements.

Contextual Notes

The discussion does not clarify certain assumptions regarding circuit configurations or the specific conditions under which the voltage divider equation applies. There may be dependencies on definitions of terms used in the context of operational amplifiers.

Who May Find This Useful

Individuals interested in electrical engineering, circuit design, and operational amplifier applications may find this discussion relevant.

logearav
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friends,
what is the role of potential or voltage divider in a circuit? in an operational amplifier circuit, while applying inputs to non inverting input, when two resistances are connected are connected across the battery they said to form a voltage divider. if the first resistance is r3 and second one is r4 which is grounded, the equivalent equation is r4/(r3+r4). what is the theory involved in voltage divider and current divider? also what is the theory behind this equation. help in this regard will be greatly appreciated. please refer my attachment provided
 

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By choosing an appropriate R3 and R4 you can make the +input of the op-amp any desired fraction of V2.
It works because the current through R3 and R4 is the same, so the voltages across them will be I*R3 and I*R4. The current is equal to V2/(R3+R4), so the voltages across R3 and R4
will be
V2*R3/(R3+R4) and V2*R4/(R3+R4)
 
Hi Logearav
There is a wonderful text which very simply explains the things you seem to want to know:
Authors: Horowitz and Hill
Title: The Art of Electronics.
 
thanks a lot members
 

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