I don't think a waterfall can cause electricity, but water is used to produce electricity.
Check this out to learn more: http://www.ehow.com/how-does_4683787_waterfall-generate-power.html
waterfalls creates electricity.
Hydro - Electricity
they are loud, and can cause mudslides.
gravity
A waterfall is full of moving water. Moving water is what generates a certain type of electricity called hydroelectricity. The famous scientist Nicolas Tesla lived near a waterfall so that he could benefit from it's power.
Erosion can cause a waterfall to retreat upstream over time by wearing away the rock and sediment at the base, creating a plunge pool. The force of the waterfall can also erode the sides of the waterfall, creating a deeper channel and possibly changing the shape of the waterfall itself.
Charges cause static electricity by charges
In a waterfall, the potential energy of the water at a higher elevation is transformed into kinetic energy as it falls. This kinetic energy can then be converted into electrical energy if a hydroelectric generator is present at the base of the waterfall, harnessing the energy of the flowing water to produce electricity.
A salmon jumping up a waterfall
it cause no electricity because of the resistance but.... if your question was..... "the caused by the flow of electrons" then the answer well be ( it cause electricity )
If it is a rather large waterfall, the water is filling up the bowls in the waterfall till it spills over back into the pool. If you have to keep adding water after using the waterfall it could be a leak in the waterfall itself. If you don't have to add water when the waterfall is not in use and you do when you use it, well, guess what? Probably a leak in the waterfall. If it is a natural rock waterfall look for cracks in the grout between rocks. If artificial rock, look for cracks everywhere.
Hydroelectric power is generated by water passing through the blades of a turbine to generate electricity. Typically this is done at a waterfall or dam.