Here is a copy of the pre-test done today.
The goal was to see if you have some of the necessary background skills and knowledge required for this course.
If you struggled in the exam today, but think you actually know the material, I suggest you do some quick revision and complete the exam again. You can hand me your solutions by 11am tomorrow.
Subscribe to:
Post Comments (Atom)
So, the thermoelectric effect plot, has a rather interesting shape.
ReplyDeleteWe suspected the entirely -ve and the entirely +ve power curves were related to the definition of the crystal axes.
Why would the zero power be significant?
Josh, you mentioned you were familiar with these graphs...
In the last two pages of chapter 1, it mentioned that the sign of the thermopower refers to the direction of the thermoelectric field. Usually in metals it should be negative as electric field is produced is pointing in the opposite direction as the temperature gradient (net flow of electrons moves from hot to cold region). I suppose in organic materials if the dominant charge carrier (e.g. holes) is positive then the thermopower can be positive although I suspect the actual reason is completely different since it varies with respect to the crystal axes. ><
ReplyDelete