In large reservoirs, the available power is generally only a function of the hydraulic head and rate of fluid flow. The flow rate can be calculated from cross-section and flow velocity. Efficiency. Hydropower or water power is power derived from the energy of falling or fast-running water, which may be harnessed for useful purposes. In these situations, the power is related to the mass flow rate. Time taken= t, In any electrical circuit, the power is computed making use of these three formulas, In regards to Voltage and current, it is articulated as, In regards to current and resistance, it is articulated as, In regards to voltage and resistance, it is articulated as. Required fields are marked *. Resistance = R. The Power Formula is used to compute the Power, Resistance, Voltage or current in any electrical circuit. How much power does it use? Answer: Known: Work done = W = 300 J, Time taken t = 10 s. Calculates the power of a hydroelectric turbine from height and volumetric flow rate. Substituting P for E⁄t and expressing m⁄t in terms of the volume of liquid moved per unit time (the rate of fluid flow, φ) and the density of water, we arrive at the usual form of this expression: A simple formula for approximating electric power production at a hydroelectric plant is: where P is Power in kilowatts, h is height in meters, r is flow rate in cubic meters per second, g is acceleration due to gravity of 9.8 m/s2, and k is a coefficient of efficiency ranging from 0 to 1. Known: m (mass) = 60 kg, Since ancient times, hydropower from many kinds of watermills has been used as a renewable energy source for irrigation and the operation of various mechanical devices, such as gristmills, sawmills, textile mills, trip hammers, dock cranes, domestic lifts, and ore mills. A trompe, which produces compressed air from falling water, is sometimes used to power othe t (time taken) = 40 seconds. 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