Final answer:
Explosions, fire, entrapment, crushing, and electrocution are considered physical or safety hazards, with electrocution being a specific type of electrical hazard that can lead to thermal or shock hazards.
Step-by-step explanation:
Explosions, fire, entrapment, crushing, and electrocution are hazards that can be encountered in various environments and are usually classified as physical hazards or safety hazards. Specifically, electrocution is a hazard related to electricity and can result in thermal and shock hazards.
A thermal hazard occurs when excessive electric power causes unwanted thermal effects, like a fire, while a shock hazard occurs when electric current passes through a person resulting in anything from a mild shock to lethal outcomes. Safety systems and devices, such as circuit breakers and insulation, are used to minimize the risk of these electrical hazards.