Explanation
French physicist Jean Charles Athanase Peltier accidentally discovered a thermoelectric effect. Peltier was conducting electrical experiments. Connect the two ends of a bismuth wire to two copper wires and connect them to the power supply and switch to form a loop. After he turned on the switch, he realized. At the two joints of copper wire and bismuth wire, one becomes hot. One place becomes cold; If the positive and negative poles of the battery are reversed, the two connectors for heating and cooling are also exchanged; This is the famous Peltier effect.
Classification
Fundamental of Material Science -> Physical and chemical basis of materials