Doubt on Energy meter

[avigreat12]

Why are there pores /holes on Aluminium disc in an Energy meter?

 

[7029 dave]

Why are there pores /holes on Aluminium disc in an Energy meter?

Give up why ?

 

[snowhead]

So the positive half of the sine wave can get back up from below the disc?

 

[stevey1983]

To cool it down when its spinning really fast like some brake discs

 

[Leesparkykent]

The magnetic fields developed in the potential and current coils cause eddy currents to flow in the meter disk. These eddy currents cause the disk to rotate. When a meter is properly calibrated, the disk will turn at a speed that is proportional to the voltage and current being measured. Anti-creep holes in the disk prevent the disk from turning when a load is not present.