Vacuum cords are coated with rubber or plastic coating to protect people from the electricity that runs through the cord. why is this?

Because if it was not covered we would get shocked if our hand where wet and touched it because the electricity would be conducted into our bodies

In fact it is not just nuclear fusion and fission that  can  transform  matter  (or mass)into energy. any time  energy  is produced, some small amount of  matter  or mass isconverted into energy.

Where's the statements?