grid
  • A framework of parallel bars, lines, dots, or the like. Also, that resembling such a framework. Seen, for instance, in an optical device, an X-ray machine, an electrostatic shield, or another instrument or device where such a grid selectively passes particles, beams, rays, or waves.
  • A framework of crisscrossed parallel bars, lines, dots, or the like. Also, that resembling such a framework. Used, for instance, to measure, specify, or determine the position of objects or images.
  • In an electron tube, an electrode which controls the flow of electrons between the cathode and anode. The structure of a grid, such as a mesh or a plate with orifices, determines how the electron beam travels, and hence controls the flow of current in said tube. There may be more than one grid in an electron tube, and any such grid may also serve to control the passage of ions. If there is one grid, it is the same as control grid, and when there are multiple grids, the innermost grid is the control grid.
  • In a storage cell or battery, a metal plate which serves as a conductor, and which also provides support for the active material.
  • A network of high voltage transmission lines which link multiple electric power plants. Such a network may run through an entire country. Also called power grid.

Not what you were looking for?