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To make it into simple wording. The gas turbine is the engine of the powerplant.
It includes three key components.
1- Compressor.
2- Combustion.
3- Turbine.
The compressor section increase the pressure .. thus you have more air into the combustion section which allow you to add more fuel.. thus more energy.
Once the fuel/gas is burned in the combustion section .. the hot gas will go to the turbine section and the pressure will start expanding as it is driving the turbine blades. The turbine blades rotation is the key to generating power.