Figure 2: The fundamental unit of a termoelectric module is a thermocouple, which consists of two branches having the parameters α_p, ρ_p, k_p and α_n, ρ_n, k_n,, respectively. These are joined by a link of zero electrical resistance at the heat source (T_h) and by a source of emf, which produces a current I, at the heat sink (T_c). The amounts that arise in this case are: α_p,n(T_h-T_c) Seebeck voltage, T_h-T_c temperature difference, α_p,nT_outI Peltier heat flow, k_p,nΔT conductive heat flow, 1 2 R I 2 Joule heating.