What is the overall energy transformation in a coal-fired power plant?
The overall energy conversion process in a coal-fired power plant is the conversion of chemical energy into electrical energy.
This process can be broken down into the following steps:
1. **Chemical energy**: Coal, as a fossil fuel, has a large amount of chemical energy stored in it.
2. **Thermal energy**: In a coal-fired power plant, coal is converted from chemical energy to thermal energy through a combustion reaction. During combustion, coal reacts with oxygen to produce heat.
3. **MECHANICAL ENERGY**: The heat energy produced is used to heat water in a boiler, converting it into high temperature, high pressure steam. This steam then drives a turbine to rotate, thus converting thermal energy into mechanical energy.
4. **Electrical energy**: The turbine is connected to the power grid through a generator. As the turbine rotates, the generator produces electrical energy which is transmitted to the grid for use by consumers.
In summary, a coal-fired power plant generates thermal energy through the combustion of coal, which is then used to drive the turbine to rotate, and ultimately converts mechanical energy into electrical energy through a generator. This process achieves the conversion from chemical energy to electrical energy.
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