level or potential.

2. Energy available is 2. Energy available is
amount of water lifted x amount of electricity x difference
difference of level. of potential.

3. If we let all the water 3. If we let all the electricity
flow away through channel flow through a wire from one
to lower level without doing screw of our generator to the
work, its energy is all other without doing work, all
converted into heat because the electrical energy is
of frictional resistance of converted into heat because of
pipe or channel. resistance of wire.

4. If we let water work a 4. If we let our electricity
hoist as well as flow through work a machine as well as
channels, less water flows flow through wires, less flows
than before, less power is than before, less power is
wasted in friction. wasted through the resistance
of the wire.

5. However long and narrow 5. However long and thin
may be the channels, the wires may be, electricity
water maybe brought from may be brought from any distance
distance, however great, however great, to give
to give out almost all its out almost all its original
original energy to a hoist. energy to a machine. This requires
This requires a great head a great difference of
and small quantity of water. potentials and a small current.