Final answer:
A short circuit can potentially cause a fire, an explosion, or the release of harmful chemicals, making the correct response 'All of the above', although a fire is the most direct result.
Step-by-step explanation:
Definition of Electrical Hazards and Short Circuits
When discussing electrical safety, it is important to understand certain terms. A thermal hazard is when excessive electric current causes unwanted heat, which can lead to fires. A short circuit is a typical example where a low-resistance path causes a high flow of current, rapidly converting electric energy to thermal energy, potentially resulting in a fire.
A shock hazard happens when electrical current passes through a person's body, which can range from a mild shock to a lethal outcome. Now, addressing the original question, a short circuit can potentially cause a fire due to excessive thermal energy being released as current flows through a low-resistance path. This could melt wiring insulation and ignite surrounding materials.
While a short circuit is less likely to cause an explosion on its own, such an event could happen if the resulting fire reaches explosive materials. It could also lead to a release of harmful chemicals if the fire affects materials that release toxic substances when heated. Therefore, the correct answer is d) All of the above, although a) a fire is the most common and direct result.
In conclusion, the effects of electric current on the human body vary according to the current's magnitude, with small currents possibly causing minor shocks and large ones being life-threatening.