Confusion about circuit schematic notations

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Discussion Overview

The discussion revolves around the interpretation of circuit schematic notations, particularly regarding the representation of voltage sources and ground symbols. Participants express confusion about whether certain terminal symbols indicate an open circuit or a closed circuit with a voltage source, and how to interpret these symbols in various contexts.

Discussion Character

  • Debate/contested
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • Some participants note that the same schematic symbol can represent either an open circuit or a closed circuit with a voltage source, leading to confusion about its intended meaning.
  • Others argue that the ground symbol's role is unclear when the voltage source is floating and not referenced to a common ground.
  • A few participants suggest that the schematic should explicitly indicate whether the terminals are open or connected to another circuit.
  • Some participants propose that the interpretation of the schematic depends on context and accompanying statements, which may not always be provided.
  • There is a discussion about the implications of assuming a voltage source versus an open circuit, with references to Thevenin/Norton reduction methods.
  • Participants express uncertainty about how to determine the source of voltage in an open circuit scenario.
  • Some contributions explore hypothetical explanations for voltage in open circuits, though these are met with skepticism by others.
  • The importance of defining a reference terminal for voltage measurements is highlighted, with discussions on how to select such a reference in circuit analysis.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the interpretation of the schematic symbols. Multiple competing views remain regarding the meaning of the ground symbol, the representation of voltage sources, and the necessity of context in understanding circuit diagrams.

Contextual Notes

Limitations include the lack of clear definitions for the schematic symbols used, the absence of context in the provided circuit, and unresolved questions about voltage reference points in floating circuits.

  • #31
jim hardy said:
"Grounding" conductor is green here and i think brown in EU.
In Australia and EU.
Green with a yellow stripe is Earth, (it was once green).
Brown is Active, (it was once red).
Light blue is Neutral, (it was once black).
The colours were changed to avoid the common red-green colour blind hazard that swapped Earth and Active.
https://en.wikipedia.org/wiki/Electrical_wiring#Colour_code
 
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