Determination of Moment of Inertia (Cont.)

• Initial kinetic energy stored in the system will be used to supply the rotational losses and gradually speed reduces to zero.
  
  
• The power consumed in overcoming the rotation losses is given by:
  
  P = Rate of change of kinetic energy
  
  
  
  
  
• dN/dt at the normal speed N can be found out graphically using the oscillogram of speed vs. time.