The word piezo means "to apply pressure, to compress" in Greek. Simply put, some materials tend to accumulate electrical charges when mechanical stress is applied to them. When pressure is applied to an insulating material placed between two opposite poles, electrical energy is produced.
The piezoelectric effect describes the phenomenon of generating electricity at a level directly proportional to the pressure applied to a piezoelectric material. Piezoelectricity, whose first serious application was made during the First World War, has the potential to revolutionize many fields from wearable pacemakers to autonomous robots...