Which of the following statements about a grounding electrode is true?

• A. It provides a backup power source to the system
• B. It provides a physical connection to earth used to bond and stabilize the system
• C. It prevents all electrical noise
• D. It is used only for lightning protection

Answer: (B)

A grounding electrode provides a physical connection to the earth to bond and stabilize the system. It creates a low-impedance path to earth so fault currents can return safely and help trip protective devices, while keeping metal parts at earth potential for safety. It does not supply power, and while grounding can help reduce some electrical noise, it won’t eliminate all of it. It isn’t used only for lightning protection; its primary role is general safety and system stability through a solid earth reference.