Fire burns stuff and in the process produces heat.
The heat can be used to do things like boil water.
Boiling water gets you steam, steam pushes a turbine and the turbine creates electricity.
Turbines work on the same principle as electro motors just in the opposite direction.
This is the basic principle of power plants that burn coal or oil or tother stuff to create electricity. In fact even nuclear power plants use this method, but instead of fire they use radioactive materials that get hot.
If you’re burning something, use that heat to boil water. This will form steam at a high pressure (given a fixed volume chamber). Use that high pressure steam to do some work, such as spinning a turbine. Use that spinning turbines to rotate a permanent magnet through a coil of wire, and that will induce an electrical current into the coil.
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