Final answer:
The term 'cold flow' does not describe the initial load when energizing a line; this is 'cold current' or inrush current, which is higher at start-up, and fuses and circuit breakers are designed to handle it briefly. High-voltage wires are aloft by air and insulators, not wrapping insulation, and voltage is commonly used to mean potential difference.
Step-by-step explanation:
The term 'cold flow' does not describe the load encountered when you first energize a line. Instead, it typically refers to the physical property of some materials that continue to deform under constant pressure without a distinct melting point. In the context of electricity and circuits, the relevant discussion would be about the 'cold current' or inrush current, which is higher than the steady-state current value when a device like a light bulb or electric motor is first turned on. Most fuses and circuit breakers are designed to tolerate these high currents for a brief period as they accommodate the inrush current until the device reaches a normal operating temperature.
Here are the answers to the true or false questions provided:
- False - The high-voltage wires are not wrapped in an insulating material; they are insulated by the air and their suspended height, as well as by insulating connectors.
- True - Voltage is indeed a common term for potential difference.
- True - Tension is the result of opposite forces pulling towards the center at the end of the connector.
- True - Dropping a bar magnet through a copper tube does induce an electric current due to electromagnetic induction.
- True - When salt is added on an ice cube with a thread resting across, the ice melts at the points of contact with the salt and refreezes, causing the thread to stick and allowing you to lift the ice cube by the thread.