The turbine is turned by mechanical energy. Moving water is an example of mechanical energy. Light energy can be used to produce electrical energy by using the photoelectric cell and the solar battery. When light shines on certain materials, an electric current is produced. The door opens when you cross the beam of light.
Solar cells produce electricity directly from sunlight.
Solar cells are made of a material called silicon which, when hit by a ray of light, gives off electrons. As long as light keeps hitting the silicon, an electric current is sent out. Heat energy can be changed to an electric current by a method called the thermoelectric effect. To create this effect, a thermocouple is used to generate electricity as a result of differences in temperature. This type of energy is used in automobiles.