What is one function of insulators?

Insulators serve a crucial function in controlling the movement of electrons within electrical systems. Specifically, they confine electron flow, preventing the free movement of charge carriers (electrons) which is necessary for the conduction of electricity. By doing so, insulators ensure that electricity flows only through designated paths, such as in wires or circuit components, rather than allowing it to leak out or be lost through unintended paths. This property is essential for the safe and effective operation of electrical and electronic devices.

In contrast, materials that increase current flow would not fulfill the purpose of an insulator, as they would allow more electrons to move freely. Similarly, insulators are characterized by their high resistance, which contrasts with the idea of decreasing resistance, and they do not enhance conductivity because that is a property associated with conductors rather than insulators.