How a gas turbine works

This short video describes how a gas turbine works

Thanks to GE for creating this video which also explains a combined cycle power plant.

Air is compressed in the turbine compressor stage, causing it to heat up. Gas is added to the mix which combusts and causes the turbine blades to spin. The turbine shaft cause the generator shaft to spin. The generator is a magnet rotating in coils of wire. The rotating magnet field generates a current in the coils – hence generating electricity.

In a combined cycle plant, the hot gases from the gas turbine are used to heat water to create steam for a steam turbine which also drives the generator.