Different sources of electromotive force
Lemon or potato
In a lemon or a potato, an aluminum wire and copper wire is inserted. By means of a terminal connected between aluminum and copper galvanometer the existence of an electromotive force is found.
A thermocouple Hilo Metal
There is a device having a connection between wires of different materials: copper and tungsten. It can be seen that by heating said junction is a potential difference which circulates through a galvanometer occurs.
A thermocouple wire mesh
There is a device having two metal sheets of different materials. It can be seen that by heating the device a potential difference which circulates through a galvanometer connected to it is produced.
Copper-Zinc battery
Battery CuZn shown in a transparent pyrex. It can be seen as the zinc electrode is worn by the action of sulfuric acid used as electrolyte.
Pila de Volta
It has built a stack composed of copper and nickel coins separated by loose cloth soaked in a saline solution.
Swatch batteries
It has a set of batteries in common use.
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