Because of the influence of the contact effect, the work efficiency of thermoelectric generator will fall with length decreasing of couple arm. The more remarkable of contact effect, the more quickly of the work efficiency will fall. 由于接触效应的影响,温差发电器的工作效率将随温差电偶臂长度的减小而降低,而且接触效应影响越显著,工作效率降低的就越迅速。