# Homework Help: Quick thermo problem[just an uncertainty]

1. Jul 20, 2010

### K29

1. The problem statement, all variables and given/known data
A semi-conducting thermistor has a resistance that veries with temperature as follows:
$$R(T)=R_0 exp[\frac{B}{T}]$$
What are the SI units of the calibration constants $$B$$ and $$R_0$$

This is just the intro chapter to my second thermodynamics course. Anyway, I'm not sure how to start off. I mean I've eliminated dimensional analysis as a way of going about things. I can see its almost an exponential decay formula. All I need is a clue or something :)

2. Jul 20, 2010

### Staff: Mentor

Mathematically, what must be the units of any argument to an exponential function? (I assume you meant R0eB/T.)

3. Jul 20, 2010

### K29

Ok the units of the exponential function must be unitless. So B is temperature so that it cancels with T. And that leaves $$R_0$$ to be Resistance in ohms! Right? Thank u.

4. Jul 20, 2010

Right!