Question

Explain how the various energy conversions that happen to take the energy from coal to you reading this question on your electronic device.

Answer 1

First the coal is burnt to boil water in a boiler. This is an example of chemical to heat energy.
This heated water, which becomes steam, is used to turn turbines that convert this heat energy to mechanical energy.
This turbine turns a generator that converts this mechanical energy to electrical energy.
This electricity passes through various transmission lines and interconnects to finally come and power your screen which is an example of electrical energy to light energy.