Other symbols for rotational inertia?

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Discussion Overview

The discussion centers on the use of symbols for rotational inertia and electrical current, particularly in the context of a project involving motors. Participants explore alternative symbols and conventions used in different contexts.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant notes the problem of using "I" for both electrical current and rotational inertia and asks for alternative symbols.
  • Another participant mentions that "J" or "Θ" could be used for moment of inertia and suggests that any symbol can be chosen as long as it is clearly defined.
  • A participant points out that "i(t)" is a more common notation for electrical current, particularly in the context of alternating current (AC) and time-varying currents.
  • Further clarification is provided that "I" is often used for direct current (DC) and that both notations are acceptable depending on the context.

Areas of Agreement / Disagreement

Participants express differing views on the commonality of symbols for electrical current, with some asserting that "i(t)" is more prevalent in certain contexts, while others maintain that "I" is still widely used. The discussion does not reach a consensus on a single preferred symbol.

Contextual Notes

There is a lack of consensus on the most appropriate symbols for rotational inertia and electrical current, and the discussion highlights the importance of context in symbol usage.

yrjosmiel
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So I'm currently doing a project on motors. It just so happens that I'm dealing with both electrical current and rotational inertia. I have one small problem.

The symbol for electrical current is I. But so is rotational inertia! Are there any other symbols for rotational inertia/electrical current?

<Moderator's note: Questionable use of language removed.>
 
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yrjosmiel said:
Are there any other symbols for rotational inertia/electrical current?

I have seen I, J or ##\Theta## as symbols for moment of inertia but you can use any symbol you want if you explain it suffitiently (e.g. with a corresponding comment at the first use).
 
yrjosmiel said:
The symbol for electrical current is I.
Much more common is i(t) with the lower case "i". Problem solved? :smile:
 
berkeman said:
Much more common is i(t)
Really? Huh, this is the first time I've encountered this.
 
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yrjosmiel said:
Really? Huh, this is the first time I've encountered this.
Well, in fairness, it's commonly written both ways, but maybe more often as "I" for DC and more often as "i(t)" for AC and time-varying currents. In any case, you certainly can choose to use either, and since your work involves I=MOI, you can chose to use i(t) for your current in your equations. :smile:
 

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