The principle behind this is that a temperature difference leads to a voltage.
- Seebeck effect: from hot to cold, which results in
- Peltier effect: When there is a function of different materials, running a current through the junction causes pairs to generate or recombine. This will either release or absorb heat due to the momentum change required for generation/recombination
- Thomson effect: Creating in a material, we cause a Peltier effect across the gradient.