When pressure is applied to piezoelectric plates, a negative charge is produced on the “expanded” side while a positive charge is produced on the “compressed” side. Once the pressure stops compressing the plates, electric current flows through the material again. Electromechanical sensors will be positioned within busy areas and along road sections. When cars pass over these sensors, they lower the plates and the kinetic energy lost by slowing down is transferred from the car to the plates. A popular example is walking and foot pressure. If you use the walking motion instead of driving, a single step would cause pressure to be applied to the plates when stepping on these piezoelectric plates; the charge produced is captured by sensors placed in the floor. This charge is then converted into electrical charge using piezoelectric material, usually in the form of crystal or ceramic. This electrical energy is then stored and used as an energy source. One step can produce enough energy to light two 60-watt light bulbs for one