(iii) A module consisting of two thermoelectric materials with Seebeck coefficient (a) +200 V/K and -300 V/K are coupled between a heat source and heat sink at temperatures of 1000 K and 500 K respectively. (a) What is the output voltage across the thermocouple? (Hint: AV-a AT for each arm) (b) What would be the net output voltage if 5 such modules are connected in series (electrically)? (c) How would you expect the Z for 1 module to change in the case of 50 modules