If you are asking why did they use iron turbines instead is water wheel the answer is becasue it took least space.
A turbine or water wheel,
a turbine would be used instead of a water wheel because a turbine does not use as much energy and it uses the wind to generate it.
By using the water to drive a turbine or a water wheel or pelton wheel.
water wheel or water turbine
In a water turbine.
Pelton invented a free jet water turbine called the Pelton wheel or Pelton turbine
turbine
A watermill is a structure that uses a water wheel or turbine to drive a mechanical process. There are two basic types, vertical wheel or horizontal wheel.
It can be used to actuate a mechanism, such as a water wheel or water turbine.
If you mean a hydroelectric generator, the weight of falling water turns a turbine or water wheel. The turbine or water wheel is attached to a generator, and turns the generator, producing electricity.
Water wheels make electricity by harnessing the energy of flowing water to turn a turbine connected to a generator. As the water flows over the wheel, it causes it to rotate, which in turn spins the turbine. The spinning turbine then generates electricity through the connected generator, which can be used to power homes and businesses.
Both have blades or buckets.