Final answer:
Electrical injuries involve thermal hazards, which can cause fires, and shock hazards, which can pass through the body with varying levels of severity. Safety systems and devices like circuit breakers and fuses help prevent the former, while defibrillators can be used to treat certain effects of the latter.
Step-by-step explanation:
Electrical injuries encompass two primary hazards: thermal and shock. Thermal hazards occur when excessive electric power produces unwanted heat, potentially causing fires or damaging structures. In contrast, shock hazards result from electric current passing through an individual's body, which can lead to a range of consequences from minor discomfort to fatal outcomes such as ventricular fibrillation. To combat these risks, various safety systems and devices are utilized, including circuit breakers and fuses to prevent wires from overheating, and defibrillators to correct erratic heart rhythms caused by electric shock.