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**P=n*p*g*h*i "Help"**

This is the power equation for a hydro turbine.

P=power

n=turbine efficiency

p=density of watter (kg/m3)

g=acceleration of gravity (9.81m/s2)

h=head(m)

i= flow rate (m3/s)

What I want to know is how to change this for running a turbine with water pressure only

P=r*g*h

P=pressure

r=water density

h=head(m)

Can anyone help with this so I can save the world