Which of following is best insulator?
Plastic, rubber, wood, and ceramics are good insulators. These are often used to make kitchen utensils, such as saucepan handles, to stop heat from flowing up to burn the cook’s hand. Plastic coating is also used to cover most electrical wires in appliances. Air is also a good insulator of heat.
Which among the following is an insulator * 2 points?
Wood is an insulator. Other all are metals which are conductors.
Which is the better insulator glass or Ebonite?
Answer. Ebonite is an insulator. Ebonite does not support the flow of electricity and does not conduct its flow through it.
Which of the following is not an insulator immersive reader 1 point glass rubber Ebonite body?
Answer. Answer:Human body is not an insulator.
Is manganin a good conductor of electricity?
Silver is the best conductor of electricity but it is not used to make wires because it is very costly. All metals (copper ,silver ,Iron etc.) CONDUCTORS : silver, copper,, aluminium,nichrome, graphite, mercury,, manganin. INSULATORS : sulphur, cotton,air,paper, porcelain,mica, bakelite, polythene.
Why manganin wire is used in potentiometer?
Generally alloys like constantan or manganin are used as potentiometer wire because they posses high specific resistance and low temperature coefficient.
Is Sulphur a good conductor of electricity?
Sulphur is a non-metal because it is consistent with three physical properties listed for non-metals. It is a poor conductor of heat and electricity, because electrons are not free to move.
What is the electrical and thermal conductivity of graphite?
The electrical conductivity of graphite increases with rise of temperature as contrasted with the decrease of the thermal conductivity with temperature rise. The thermal and electrical conductivities both increase with temperature rise, the thermal conductivity linear, in the temperature range -191° to 100°C.
Which is good conductor diamond or graphite?
1 Answer. (a) In a graphite molecule, one valence electron of each carbon atom remains free, Thus making graphite a good conductor of electricity. Whereas in diamond, they have no free mobile electron. Thats why diamond are bad conductor electricity.
Is Diamond a good or bad conductor of electricity?
In a graphite molecule, one valence electron of each carbon atom remains free, Thus making graphite a good conductor of electricity. Whereas in diamond, they have no free mobile electron. Hence there won’t be flow of electrons That is the reason behind diamond are bad conductor electricity.
Why is graphite slippery?
Graphite has delocalised electrons, just like metals. The forces between the layers in graphite are weak. This means that the layers can slide over each other. This makes graphite slippery, so it is useful as a lubricant .