Uncovering the Physics Behind Everyday Phenomena

  • Context: High School 
  • Thread starter Thread starter gikiian
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    Phenomena Physics
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Discussion Overview

The discussion explores the physics behind color coding in electrical connections, particularly focusing on the conventions for connecting cables to voltage terminals. It touches on the implications of polarity and how it affects measurements.

Discussion Character

  • Technical explanation, Debate/contested

Main Points Raised

  • Some participants discuss the importance of color coding in identifying the polarity of connections, suggesting that it helps in comparing voltages.
  • Several participants assert that the red cable is typically connected to the positive terminal and the black cable to the negative terminal, emphasizing this as a standard practice.
  • One participant notes that reversing the leads would result in a negative reading, but this does not affect the validity of the measurement itself.
  • Another participant expresses surprise that earlier responders did not recognize the standard color coding convention.

Areas of Agreement / Disagreement

There is disagreement regarding the interpretation of color coding and its implications for voltage measurements. While some participants agree on the standard practice of connecting red to positive and black to negative, others seem to misunderstand or overlook this convention.

Contextual Notes

The discussion does not clarify the assumptions behind the color coding or the specific contexts in which these conventions apply. There is also no resolution on the implications of reversing leads for measurements.

gikiian
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What's the physics behind it?
 
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Color coded so you know which is which.
 


Consistency, polarity convention.

This way, you can compare to voltages and know whether they are both the same polarity or not, e.g., they are 100V and 150V, or 100V and -150V.
 


I think it's the other way round. We usually connect the red cable to the positive terminal and the black to the negative.
 


Gordianus said:
I think it's the other way round. We usually connect the red cable to the positive terminal and the black to the negative.

You beat me to it :) yes exactly. I am a bit suprised the first 2 responders didnt pick up on that one lol

Dave
 


Gordianus said:
I think it's the other way round. We usually connect the red cable to the positive terminal and the black to the negative.
I agree. And the only reason I can think of is that you would prefer to have a positive number for the meter reading. But it really isn't necessary; if you reverse the leads you just get -1 times the reading you would have gotten.
 

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