Lorentz Transformations generally describe the transformations for observations between mechanical phenomenon systems in relative motion. We all know that the electrical charge of associate isolated system is relativistically invariant. We have studied the volume charge density in Special and Most General Lorentz Transformations. If one frame moves on x-axis then we will notice this in Special Lorentz Transformation. On the other hand if the motion of the moving frame is not on the x-axis relative to the rest frame however the motion is on any arbitrary direction then we will notice this formula for the Most General Lorentz Transformation. We also investigated the changes of the volume charge density of moving system in terms of that of rest system in Most General Lorentz Transformations at different angles and velocities.

We know that charge density is changed when it is observed from a moving frame of reference due to the length contraction. In this paper the transformation formula for the volume charge density in mixed number Lorentz transformation has been derived and the changes of the volume charge density of moving system in terms of rest system in mixed number Lorentz transformations at different angles and velocities have been shown graphically.