Different Types of Energies or Head of a Liquid in Motion. The following are the three types of energies or head of flowing liquids:

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**1. Potential energy or potential head.**It is due to the position above some suitable datum line. It is denoted by z.**2. Kinetic energy or kinetic (or velocity) head.**It is due to the velocity of flowing liquid. Its value is given by v2/ 2g, where v is the velocity of flow and g is the acceleration due to gravity.**3. Pressure energy or pressure head.**It is due to the pressure of liquid. Its value is given by p/w, where p is the pressure in N / m2 and w is the weight density of the liquid in N / m3.**Note:**The total energy or total head of a liquid particle in motion is given as follows :**Total energy, E**= Potential energy + Kinetic energy + Pressure energyand

**Total head, H**= Potential head + Kinetic head + Pressure head

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