Why is a lightning arrester important in electrical systems?

• A. It helps to increase the electrical current
• B. It protects systems from power surges caused by lightning
• C. It minimizes the loss of electrical energy
• D. It isolates circuits from ground faults

Answer: (B)

A lightning arrester is crucial in electrical systems because it serves as a protective device that mitigates the risk of damage from lightning strikes. When lightning occurs, it can create significant power surges and electrical transients that may exceed the voltage rating of electrical equipment. The primary function of the arrester is to divert these excessive voltages away from sensitive electrical components and safely discharge them to the ground. By providing a controlled path for the surge current, the arrester helps to protect transformers, switchgear, and other critical infrastructure from destruction or failure.

The other options do not accurately describe the main purpose of a lightning arrester. Increasing electrical current is not a function of this device; rather, it is focused on protecting against surges. Minimizing the loss of electrical energy and isolating circuits from ground faults involve different types of equipment and principles, such as transformers for energy efficiency or circuit breakers for fault isolation.