In a river, the water level drops at every dam, and the total energy you can generate depends on the river flow rate and the height change. The river’s height change is set by its geography: you can split it up over several small dams or one big one, but it doesn’t change the total energy output.
In a thermal power plant, the temperature drops at every turbine, and the total energy you can generate depends on the heat flow rate and the temperature change. The power plant’s temperature drop is set by the materials it’s made from: you can split it up over several small turbines or one big one, but it doesn’t change the total energy output.
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