Com M. Go To Your Study Dashboard. Post Answer. I infoexpert Latest Asked Questions can I give the neet exam where my age is 2 month small to 17 Q. Start Now. Write your question. Create Your Account Name. Mobile No. I am already a member. Your Answer. Materials like glass and plastic are poor electrical conductors, and are called insulators. They are used to stop electricity from flowing where it is not needed or where it can be dangerous, such as through our bodies.
Materials that are good conductors of thermal energy are called thermal conductors. Metals are very good thermal conductors. Materials that are poor conductors of thermal energy are called thermal insulators. Gases such as air and materials such as plastic and wood are thermal insulators. What are some bad insulators? Non-metals are generally bad conductors or insulators. Metals, on the other hand, are good conductors. Some other examples of poor conductors of electricity are mica, paper, wood, glass, rubber, Teflon, etc.
Examples of insulators include plastics, Styrofoam, paper, rubber, glass and dry air. The division of materials into the categories of conductors and insulators is a somewhat artificial division. Gold is used as a contact metal in the electronics industry as it is a good conductor of both electricity and heat.
Gold wire Gold is ductile: it can be drawn out into the thinnest wire. Gold, like any metal is a very good conductor compared to non metals, and a very poor insulator. Conductor is opposite of insulator. They are measures of how much heat is transmitted through a material.
Plastics are excellent insulators, meaning they efficiently trap heat—a quality that is an advantage in something such as a coffee cup sleeve. Now a team of engineers at MIT has developed a polymer thermal conductor, a plastic material that works as a heat conductor to dissipate heat rather than insulating it. There are dozens of polymers to choose from that offer high dielectric strength and excellent fire resistance. Metal is a good conductor of heat, while wood and plastic are good insulators.
A conductor transfers thermal energy heat well, while an insulator does not transfer thermal energy heat well. A metal block is a better conductor and so energy is transferred more quickly to that ice cube. Plastics are good insulators so, even though the plastic is at a lower temperature than your fingers, little energy conducts to the plastic and it feels warm. In the same situation, metal dissipates heat faster than plastic.
Which of the following is NOT an example of a semiconductor material? Which of the following is NOT an advantage of a hot carrier diode? When a material becomes a superconductor, its resistivity becomes.
Consider the following statements with regard to semiconductors: 1. In n-type material free electron concentration is nearly equal to the density of donor atoms. Phosphorus is an example of n-type impurity. Conductivity of Si is more sensitive to temperature than Ge. Which of these statements are correct? How many valence electrons exist in Silicon? HEMT used in microwave circuit is a.
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