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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.
Firstly, to generate electricity, youâll require a fuel source, such as coal, gas, hydropower or wind. In Australia, most of our electricity supply is generated from traditional fuels, such as coal and natural gas, with around 14 percent coming from renewable energy sources. 1 Regardless of the chosen fuel, most generators operate on the same proven principle: turn a turbine so that it spins magnets surrounded by copper wire, to get the flow of electrons across atoms, which in turn generates electricity.