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Italian physiologist Luigi Galvani (1737-1798) is noted for his studies on the effects of electricity on animal nerves and muscles. Galvani accidentally discovered that the leg of a frog twitched when touched with an electrically charged scalpel.
Principles discovered by Galvani and Oersted led to Volta’s invention of the first electric battery. In this experiment you’ll build a Galvanometer. A Galvanometer is an instrument for detecting the strength and direction of electrical current.
Materials you will need:
3. Increase the wire turns around the dish five more times. Repeat step two. Did the needle turn farther and faster?
Performing the above experiments show that the magnetic field generated in an electric circuit can be changed. A Galvanometer works on some of the same principles. As the current flowing through a Galvanometer increases so does the magnetic field which in turn further deflects the needle.