Using DC motors in Physics experiments

Abstract

In this work we have used DC motors, working as electric generators, in didatic Physics experiments. Two different applications of these devices are discussed: a homemade anemometer and a frequency counter, which were built with low-cost electric motors. The data acquisition was performed using a personal computer and a sound card, which work as an oscilloscope, a spectrum analyzer and an analogical/digital converter.

electromagnetism; electric generator; data acquisition