Demonstration of Peltier effect – S.G. Starling Method

Two coils C1 and C2 of insulated copper wire are wound over the two junctions J1 and J2.These coils are connected across the two gaps of meter-bridge and the balance-point is found on the bridge wire. Now a current is passed through the rods from Sb to Bi. The junction J1 is heated and J2 is cooled. The resistance of copper varies rapidly with change of temperature. Hence the balance in the bridge is immediately upset. The galvanometer shows a deflection. If the current is reversed, the deflection in the galvometer also gets reversed. This shows that the junction J1 is now cooled and J2 is heated