Answer Posted / lucy
1)Most hydroelectric power comes from the potential energy
of dammed water driving a water turbine and generator. In
this case the energy extracted from the water depends on
the volume and on the difference in height between the
source and the water's outflow. This height difference is
called the head. The amount of potential energy in water is
proportional to the head. To obtain very high head, water
for a hydraulic turbine may be run through a large pipe
called a penstock.
2)Waterwheel (Horizontal wheel)
The wheel is usually mounted inside the mill building below
the working floor. A jet of water is directed on to the
paddles of the water wheel, causing them to turn. This is a
simple system, usually used without gearing so that the
axle of the waterwheel become the spindle of the mill. This
system is sometimes called the Norse mill. In a sense it is
the ancestor of the modern turbine
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