Obtain the resistance of a ntc thermistor

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Homework Help Overview

The discussion revolves around determining the resistance of an NTC thermistor based on its temperature and a given characteristic temperature of 3900K. The original poster expresses difficulty in finding the appropriate equation to relate resistance and temperature.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the equation R = A.e^(B/T) and question its applicability without logarithmic knowledge. There is uncertainty about the relationship between resistance and temperature, particularly whether it is linear or not.

Discussion Status

Some participants are seeking additional information to clarify the problem, while others are exploring assumptions about the resistance at the characteristic temperature. There is no explicit consensus on the method to approach the problem, and various interpretations are being considered.

Contextual Notes

The original poster has been provided with specific values, including a resistance of 47 ohms at 20 degrees Celsius, but expresses uncertainty about the equations and relationships necessary to solve the problem.

Sparky2020
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Please Help!

HI.
Im really struggling to work out how to obtain the resistance of a ntc thermistor from just having the temperature. I've been given the characteristic temp. of 3900K, labelled B for some reason. the only equation i can find to use is R = A.e to the power of B/T. I think this is somwthing to do with the base of natural logarithms, but when i asked my lecturer, he said no knowledge of logs was needed.
Please help!

Thank you loads in advance..
 
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Is there any more information?
 
The question asks that if the ntc thermistor has a resistance of 47 ohms at 20 degrees celsius, and its characteristic temp is 3900K then what is its resistance at 100 degrees celsius?
I can't even find a suitable equation which relates its resistance to its temperature.
 
I am going to guess here because I don't actually know. I'm guessing the resistance is 0 at the characteristic temperature. Perhaps you know about that. I will also assume a linear relationship. If it isn't linear, you need more information anyhow.

Assuming this, it's a ratio. Actually, I'll let you work it out rather. Try with these assumptions.
 

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