Which of the following is not a type of electric resistance heating wire used in residential applications?

The option that is not a type of electric resistance heating wire used in residential applications is glass enclosed. Electric resistance heating relies on materials that can heat up when an electric current flows through them. Common materials used in this type of heating include copper, aluminum, and nichrome (nickel-chromium alloy), which are all known for their conductive properties and ability to generate heat effectively.

Copper is widely used due to its excellent electrical conductivity, while aluminum is lighter and less expensive than copper, providing a viable alternative in some applications. Nichrome, on the other hand, is specifically designed for heating elements due to its high resistance and ability to withstand high temperatures without oxidizing.

Glass, while it can be used as an insulating material or protective enclosure for heating wires, does not serve as a conductive heating element itself. In electric resistance heating wire applications, the focus is on materials that can directly convert electrical energy into thermal energy, which glass cannot effectively do. Therefore, we consider glass enclosed as not being a type of electric resistance heating wire used in residential contexts.