Question

Find odd one out. Thermal plant, wind energy plant, hydroelectric plant, solar power plant​

Answer 1

Thermal plant

• in thermal power plant heat energy of coal is converted into electrical energy

• first fuel is used to boil water to produce steam at high pressure
• then this high pressurize steam is transferred to the turbine for moving the shaft
• the shaft is connected to a generator.
• fuel is used as coal.

wind energy plant

• The wind turbine plant is located in where a high wind area.
• this plant runs on wind
• generally, there are high towers in the field and at the top of the tower, blades are connected to the generator shaft directly.
• there is no need for fuel.

hydroelectric plant

• in the hydroelectric plant the potential energy of water is converted to generate electricity.
• this plant is located in rivers. the dam is made on the rivers to store the water.
• while generating electricity the water is used to rotate the turbine.
• the shaft of generators is connected to the turbine.

solar power plant

• solar power plant is used to generate electricity using suns energy.
• by using photovoltaic cells light is converted into electric current by the photoelectric effect.

so the correct answer is a thermal power plant

because it requires external fuel for working.

and others do not require any external fuel.