Question

which energy transformation occurs at a coal fired electrical power plant?

1) heat is completely transformed into mechanical energy, which is then converted to electricity

2) mechanical energy is completely transformed into heat, which is then converted into electricity

3) electricity is completely converted into mechanical energy and heat

4) heat is partially transformed into mechanical energy which is then converted to electricity

Answer 1

Heat energy released from the burning of coal is converted into mechanical energy which then converted into electricity .

option (1) is correct.

burning of coal releases heat energy which is used to generate the steam . stem is used to run the steam turbine which is coupled to an alternator which generates the electricity. therefore heat energy is converted to mechanical energy through turbine and mechanical energy converted to electrical energy through alternator or generator.