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The presence of warm tools or cords serves as a significant indicator of an electrical hazard. When tools or extension cords generate heat during normal use, it suggests that there may be an issue with the electrical flow, such as increased resistance due to damaged insulation or an overloaded circuit. This excessive heating can lead to potential fire risks, short circuits, or electrocution if not addressed promptly.

While dim lighting can indicate issues with electrical supply, such as insufficient voltage or faulty connections, it does not directly signal immediate danger in the same manner that warmth indicates potential overheating and malfunction. Visible wires may also be a concern, but they are not necessarily indicative of a hazard unless they show signs of damage or fraying. Sparking outlets clearly point to a dangerous situation but may not always manifest as consistently as warm tools or cords do, making warmth a more reliable early warning sign of electrical hazards.