Final answer:
Temporary electrical cords should not be loose when crossing aisles, even if over a carpet, because it poses a safety hazard and is thus False. Additionally, high-voltage power lines are not insulated, and magnetic strips on credit cards can be damaged by magnets.
Step-by-step explanation:
The statement that temporary electrical cords crossing aisles can be loose if they are stretched over a carpet is False. Doing so can create a tripping hazard and possibly damage the cord, leading to electrical risks. Cords should be properly secured and covered to prevent accidents.
Answers to Provided Statements:
- High-voltage wires are held aloft by insulating connectors, but these wires are not wrapped in an insulating material; they are typically bare, so the statement is False.
- Tension in a connector is indeed a result of opposite forces that pull each point apart along the connector's length, with the ends pulling towards the center, so the statement is True.
- In a circuit diagram, we cannot assume the voltage is the same at every point in a given wire due to potential voltage drops across components; the statement is False.
- When you drop a bar magnet through a copper tube, it indeed induces an electric current in the tube due to electromagnetic induction, so the statement is True.
- The electric-field lines from a positive point charge do spread out radially and point outward, making the statement True.
- Although wood is generally an insulator, lightning can travel through a tree due to the immense potential difference and energy of the lightning bolt, making the statement True.
- If a long, inexpensive extension cord is used with a refrigerator and it doesn't run as expected, the problem might be due to the cord's inadequate gauge or power rating causing voltage drop or insufficient current, hence the fridge's performance issues.
- It is recommended to keep credit cards with magnetic strips away from permanent magnets as they can demagnetize the strips, so the statement is True.