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A material used for electrical wiring must have what?
free electrons
A material used for electrical wiring must have?
free electrons
What is the ability of a material to oppose the movement of electrons through it?
A material that has a high resistance to the flow of electrons is an insulator.
Why electron freely in a metal?
The term conductor is generally applied to a substance or material that has a lot of free electrons in it. The name conductor is applied because the free electrons are already there. A material does not have free electrons because it is a conductor, but is a conductor because it has a lot of free electrons. That said, let's look at what's going on. These free electrons have energies that permit them to "wander" through the conductor; they're not "locked into" the structure of the material. And when a voltage (potential difference) is applied, current flows through the conductor because the free electrons are moving. They're made to move by the applied voltage. If we take the case of a wire in a circuit, the wire is a conductor. This wire, say a copper one, has many free electrons in it, and when we apply a voltage, electrons move. The voltage forces electrons into one end of the wire, and the free electrons "shift over" and electrons emerge from the other end of the wire. This movement of free electrons in response to an applied voltage through an conductor is the essence of current flow in that conductor.
What is it called when free electrons in metals transferring energy by colliding with other atoms or electrons?
conduction
What are the free electrons in a metal called?
Free electrons in a metal are called delocalized.
What substance that allows the flow of free electrons?
Material that permits the free flow of electrons
What is material that will not release electrons nor allow free electrons to pass?
Insulator
What material keeps electrons from moving?
This is called an insulator material.
A material with many free electrons is referred to as a good what?
semiconductor
A material used for electrical wiring must have what?
free electrons
Why is wood a poor cunductor?
conductivity closely relates to the number of free electrons , and in the wood material the electrons are not present in free state.
What is a conductor and a insulater?
A conductor is any material in which electrons are free to flow, whereas an insulator is any material in which the electrons are tightly bound to the molecules with which they are associated.
How many valence electrons does insulator have?
It is not the number of valence electrons that an insulator has that is important. It is the way the valence electrons are "arranged" in the structure of the material that matters. If not all the valence electrons of a substance are "involved" in the structure of the material, then these electrons are said to be free electrons. They move about in the substance, and are free to contribute to electron flow. The metals are examples. In contrast with this, if all the electrons are bound up in a material, they are not free to support current flow, and the material is said to be an insulator. Said another way, if the valence electrons in a material are in a Fermi energy level that overlaps the conduction band for that material, the material is a conductor. In an insulator, the valence electrons are all in Fermi energy levels that are below the conduction band for that material, and it is an insulator. Applying a voltage to an insulator will not "lift" the valence electrons up into the conduction band to allow them to support current flow.
What types of materials conduct heat?
Any material that has free electrons.
A material used for electrical wiring must have?
free electrons
Why do wires use metals?
The purpose of a wire is to carry some sort of electrical signal. This requires that the electrons in the material be able to move freely. Materials with free movable electrons are called "metals".
