Electricity and Magnetism

5E 50.10 - Thermocouple

Demonstrates: As an example of thermal energy being converted to electrical energy, thermoelectric current is observed.
Description: A temperature difference between two ends of a conductor results in a potential difference between the two ends. The size and polarity of the potential difference depends on the type of metal. A thermocouple is formed when two dissimilar metals are joined at one end. When the joined end is kept at a different temperature from the open ends, a potential difference is maintained between the open ends. This potential difference can be used to drive current through a galvanometer.

5E 50.20 - Electrical Equivalent of Heat

Demonstrates: Shows that electrical power causes heat.
Description: 10' of 20 gauge wire is strung between two carts. As voltage in the wire is increased the wire will heat and break.