Final answer:
True, intranets link different systems within a company, forming a secure and private network for internal use. High-voltage wires, however, are not wrapped in insulating material; the air serves as the insulation.
Step-by-step explanation:
The statement 'Intranets link different systems and networks within a firm' is true. An intranet is a private network that is contained within an enterprise. It is designed to connect a company's computers and related equipment into a cohesive and secure network that serves internal employees and systems. Intranets enable employees to share information, collaborate on projects, and access corporate resources smoothly and effectively. They typically use the same software and protocols as the internet but are accessible only to internal staff.
Regarding the separate example about high-voltage wires, these wires are indeed held aloft by insulating connectors; however, they are not wrapped in insulating material because they are designed to operate in open air where insulation is not necessary. The air itself serves as an insulator. Therefore, the statement about high-voltage wires is false.