Identify one common grounding electrode.

The selection of a ground rod as a common grounding electrode is based on its effectiveness and widespread use in electrical systems. Ground rods are typically made of conductive materials, such as copper or galvanized steel, allowing them to efficiently dissipate electrical currents into the earth. They are driven into the ground and provide a low-resistance path for fault currents and lightning strikes, ensuring safety by preventing voltage buildup that can lead to electrical shock or fire hazards.

In addition, grounding rods are specified in electrical codes and standards. They must meet certain requirements regarding their material, length, and installation depth, making them a reliable component of grounding systems in both residential and commercial settings. This contrasts with other options: a tree root does not provide consistent conductivity, a plastic pipe is an insulator and cannot conduct electricity, and while a metal plate can serve as a grounding electrode, it is less common and may not be as effective as a ground rod in typical applications.