A turbine is a device which generates net work by passing a fluid, such as steam, thorugh a series of rotating blades. The blades are perpdicular to the flow direction of the steam. The steam expands in the turbine due to the pressures below atmospheric created by a condenser attachted to the turbine. The expansion of the steam results in the the rotation of the turbine blades. The roatating blades are atttached to a shaft. This shaft does mechanical work on the A/C windings of the electrical generator.
The electrical generator contains three A/C windings which are spaced 120 degrees apart. These windings consist of a magnet which is encased in wire. The magnet creates a magnetic field. The work done by the blades on the windings results in a motion which is perpendicular to the magnetic field. A current is generated in the due to this motion in a direction which predicted by the right hand rule. The right hand rule states that this dirction is perpedncular to both the motion of the windings and the magnetic field. The wires on the A/C windings have a resistance associated with them. The voltage drop produced by the A/C windings is dependent on the product of the current and the resistance. This statement is defined as Ohm's Law.
Click here to see a picture of the right hand rule which doesn't exist
