Experiments on electromagnetism for teachers and students of the secondary school

We describe some of the educational experiments carried out in the framework of the “OpenLab” at the Florence University. In particular we focus our attention on three measurements, which can be carried out in a laboratory of the secondary school and concern the electromagnetism: the determination of the Earth’s magnetic field in two methods, the construction of a simple electrometer and some measurements showing the operation of a moving-iron ammeter. The described measurements are quantitative and well reproducible, and have been tested with students and teachers.