What electrical hazard is caused by aging wiring or insulation?

Aging wiring or insulation presents significant risks primarily related to electrical shock and fire hazards. As wiring deteriorates, its insulation can become brittle and cracked. This degradation can expose live wires, creating a direct path for electrical shock to occur for anyone who comes into contact with them. Additionally, damaged insulation can lead to arcing or short circuits, which generate heat and can easily ignite surrounding materials, causing fires.

The other options may relate to electrical systems but do not capture the primary dangers associated with aging wiring. For example, while a forceful electrical discharge might be a concern in other contexts, it's not a direct result of aging wiring but rather a byproduct of malfunctioning or misconfigured systems. Similarly, the inability to conduct electricity would not accurately describe aging wiring; it can still conduct electricity, but potentially in a dangerous manner. Overload of circuits typically refers to using too much current beyond the wiring's capacity, which is separate from issues arising from aging materials.