Final answer:
Jumper cable safety involves various systems and guidelines to prevent shock and thermal hazards. High-voltage wires are held by insulators but are not covered with an insulating material. Plastic insulation and the three-wire system with ground wires are essential for safety in electric circuits.
Step-by-step explanation:
Understanding jumper cable safety is important when working with electrical systems. To ensure safety, there are various mechanisms and guidelines in place. The high-voltage wires seen atop metal-frame towers are indeed held aloft by insulating connectors, but these wires are not wrapped in insulating material, making that statement false. An isolation transformer is a device specifically designed to prevent shock hazards by isolating the primary circuit from the secondary. When working with high-power electric circuits, the practice of working with 'one hand' or keeping 'one hand in your pocket' is advised to minimize the risk of current passing through the heart should an accidental shock occur.
Plastic insulation on live/hot wires serves the role of preventing both shock and thermal hazards. Moreover, modern wiring often includes a three-wire system with live, neutral, and ground wires to prevent both types of hazards. This system, alongside the grounding of the neutral wire and appliance cases, enhances safety significantly. In electricity, tension is the result of opposing forces pulling each point of a connector, such as a cable, in opposite directions along the length of the connector, which is a true statement.