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Thermionic generators convert heat or light into an electric current by using the temperature difference between two metallic plates that are separated by a vacuum. The hot plate is heated either by incident light or thermal conduction and this causes electrons to evaporate from its surface.
Best Answer: Heat can be generated in several ways. 1. Friction (rub you hands together real fast) 2. Electricity passing through certain elements that cause resistance to the flow of electrons. (electric heater).Type of Friction. 3. Chemical action (fire).est Answer: Heat can be generated in several ways. 1. Friction (rub you hands together real fast) 2. Electricity passing through certain elements that cause resistance to the flow of electrons. (electric heater). Type of Friction. 3.