I'm attempting to calculate the amount of power (in KWH) produced by a water turbine based on x litres of water falling x metres vertically through a tube of x cm diameter So far i've managed the following: H = height (distance fallen) (m) Time = Secs R = Radius of the pipe (m) Velocity (m/s) = (2 x H x G) ^ 0.5 Volume / Sec = Velocity x Time x Pi x R^2 mass (kg) / Sec = (Volume / sec) x 1000 Energy = (Mass x Velocity^2)/2 = wattage generated My questions is.... how do i convert this wattage generated in KWH generated? Once I have this am i correct in thinking I can do: (KWH generated / 3600) * (time taken for x litres of water to fall through the pipe). To calculate the KWH generated by the x litres of water falling? Any help / guidance anyone could give me would be greatly appreciated. - As you can (maybe) tell i'm by no means a physics graduate but i do have a basic understanding. Any help anyone could give me would be greatly appreciated. Many Thanks P.s For the purposes of this i'm happy to work with a turbine having 100% efficiency.