Which of the following is a potential hazard when using extension cords?

Using extension cords can indeed pose several hazards, and one of the primary concerns is the risk of fires from overloaded cords. When an extension cord is used to power devices that require more electricity than the cord can safely handle, it creates excessive heat. This heat buildup can lead to insulation failure and, ultimately, a fire. Overloading can occur when multiple high-wattage appliances are plugged into the same extension cord or when using a cord that is not rated for the load being drawn by the devices connected to it.

The other options suggest issues that while they may occur, do not represent direct hazards in the same way. Noise from damaged cords can indicate a problem but is not typically a primary concern compared to the fire hazard that arises from overloading. Similarly, short circuits from light usage are generally not a common issue; rather, short circuits are more often associated with poor connections or damage to the cord rather than usage that is below the rated capacity. Therefore, understanding the risk of fire from overloaded cords is crucial for safe usage of extension cords in any electrical work.