Bn Ch 1 Quiz 2

Electric wires are often covered in plastic to insulate them. Insulation is necessary to prevent the flow of electricity from the wires to surrounding objects or people, reducing the risk of electrical shocks or fires. Plastic is a good insulator because it does not conduct electricity. Additionally, plastic covering provides protection against moisture, dust, and other potential damages that could affect the wires' performance or safety.

A silver spoon is a good conductor of electricity because silver is a metal and metals are generally good conductors of electricity.

Insulators are materials that do not allow electricity to flow through them easily. They have high resistance to the flow of electric current, preventing the movement of electrons. This is due to their tightly bound electrons, which do not have enough energy to move freely. Examples of insulators include rubber, plastic, glass, and wood.

Metal and carbon conduct electricity because they are both materials that have free electrons that can move freely within the material. In metals, the outer electrons of the atoms are not tightly bound to the nucleus, allowing them to move easily and carry electric charge. Carbon, in the form of graphite, also has free electrons due to its unique structure, which allows it to conduct electricity. Plastic and rubber, on the other hand, are insulators and do not have free electrons to carry electric charge.

Rubber, cd, wooden table, and key cannot conduct electricity. However, a key and a fork are both made of metal, which is a good conductor of electricity. Therefore, the key and fork are the only items in the list that will conduct electricity.