**The power curve shows the power consumption of the pump at a given flow.**

P (power) can be calculated if η is known by using the following equation:

__ρ x g x H x Q__

P = η

P = power [W]

ρ = density [kg/m^{3}]

g = acceleration due to gravity [m/s^{2}], "9.81" is normally used as the value for g.

H = head [m]

Q = flow [m^{3}/s]

η = efficiency (has no unit)

The following equation is used to get a quick but not accurate calculation of the power:

__Q x H x 2.73__

P = η

P = power [W]

H = head [m]

Q = flow [m^{3}/h]

η = efficiency (has no unit)

ρ and g are a part of the "2.73" factor, where ρ = 1000 [kg/m^{3}] (water at 4 °C) and g = 9.81[m/s^{2}]. Q is in [m3/h] instead of [m^{3}/s] and is also a part of the "2.73" factor.