It is a Punnett Square :]
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it accelerate the motion of electron emitted by the filament if given a positive charge, similarly if negative voltage to grid the current flow through the grid is reduced. the more positive grid shows less current.
x goes a cross (across, get it?)
It is not possible to answer in terms of a grid that cannot be seen, but a normal grid of 2 squares x 2 squares will have 5 squares.
Infinite.
Count the number of squares across the top of the grid, the count the number of squares down the side of the grid. Then multiply these two numbers If you have a grid of 100 squares by 60 squares then the number of squares in the grid is 100x60 = 6000