Which of the following is a common hazard when working with electrical circuits?

When working with electrical circuits, one of the most significant hazards is electrocution from live wires. This risk arises due to the potential for electric shock when an individual comes into contact with energized parts of a circuit. The severity of such an incident can vary, ranging from minor shocks to fatal injuries, depending on the voltage and current involved, as well as the path of the electricity through the body.

Understanding this hazard is crucial for safety practices in the electrical field. Proper safety measures, such as wearing insulated gloves, using insulated tools, and ensuring that circuits are de-energized before working on them, can help mitigate this risk. The emphasis on this hazard reflects the importance of adhering to safety protocols when handling electrical systems.

The other options, while they do pose risks in specific contexts, do not directly relate to the fundamental hazards associated with electrical circuits as closely as the risk of electrocution does. For instance, thermal burns and overheating may occur in certain situations, but they do not represent the immediate danger that live wires present during electrical work. Similarly, while falling from heights is a significant safety concern in certain trades, it does not pertain specifically to the hazards faced when working with electrical circuits.