2.2.2 Calculating the resistance Rp and Rn of the thermoelectric couple pellets

The electrical resistivity ρ of each pellet can be found and/or measured, with a typical resistivity for p-type Bi2Te3 thermoelectric pellets of around 1.75 � <sup>10</sup>�<sup>3</sup> Ohms-centimetre, and for n-type Bi2Te3 pellets of around 1.35 � <sup>10</sup>�<sup>3</sup> Ohmscentimetre [10]. The resistance Rp of the p-type pellet can then be found by:

$$R\_p = \frac{L\_p \rho\_p}{A\_p} \text{ measured in Ohms} \tag{2}$$

where ρ<sup>p</sup> is the electrical resistivity of the pellet in Ohms-cm, Lp is the length of the pellet in cm, and Ap is the cross-sectional area of the pellet in cm2 found by:

$$A\_p = width \times depth \text{ measured in cm}^2 \tag{3}$$

Similarly, the resistance of the n-type pellet Rn can be found by:

$$R\_n = \frac{L\_n \rho\_n}{A\_n} \text{ measured in Ohms} \tag{4}$$
