Obtain the resistance of a ntc thermistor

1. Nov 3, 2005

Sparky2020

HI.
Im really struggling to work out how to obtain the resistance of a ntc thermistor from just having the temperature. Ive 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.

2. Nov 3, 2005

3. Nov 3, 2005

Sparky2020

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 cant even find a suitable equation which relates its resistance to its temperature.

4. Nov 3, 2005

verty

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.