What component is associated with system grounding?

The power supply cord plays a critical role in system grounding as it typically incorporates the necessary grounding connections that ensure safety and operational integrity. Grounding is essential for protecting both the equipment and users from electrical faults by providing a safe pathway for stray currents. When properly grounded, if a fault occurs, such as a short circuit, the grounding mechanism allows for the immediate flow of excess electricity to the ground rather than through a person or sensitive equipment.

The other options, while important components of an electrical system, do not primarily serve the purpose of grounding. The circuit breaker is responsible for interrupting power in the event of an overload or fault, but it does not provide a grounding function. Similarly, the load resistor is used to manage excess current in various applications but does not relate directly to the ground connection. The circuit board contains the components that enable the operation of the system but does not inherently include grounding features. Thus, the power supply cord's role in providing grounding makes it the correct answer.