SCIENCE
PHYSICAL SCIENCES
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
plastics
|
|
|
metals
|
|
|
rubber tubing
|
|
|
cotton cloth
|
Detailed explanation-1: -Why are metals not insulators? Metals are good conductor of electricity because they have very large number of free valance electrons whereas glass has no free electrons to conduct electricity.
Detailed explanation-2: -Hence, The material which are neither good conductors nor insulator of electricity are called semiconductors.
Detailed explanation-3: -REVIEW: In conductive materials, the outer electrons in each atom can easily come or go, and are called free electrons. In insulating materials, the outer electrons are not so free to move. All metals are electrically conductive.
Detailed explanation-4: -Materials that do not let current flow easily are called insulators. Most nonmetal materials such as plastic, wood and rubber are insulators. You will notice this if you have ever plugged something into a wall outlet.
Detailed explanation-5: -Thus, Iron ( Fe ), Mercury ( Hg ), Tungsten ( W ) are metals that are bad conductors of electricity.