What are the definition of good and bad conductor of electricity?

Answer 1

An object is called as a good conductor of electricity when it allows the electrons to flow within it easily ( for example a copper rod). Resistance it the opposition to the flow of electrons through it. Resistance is affected by following factors of any object:

1) More the length more the resistance

2) Less diameter, more the resistance

3) Temperature

Resistance of any object can be lowered by lowering the temperature. The point where the Resistance of any conductor drops close to zero is called superconductivity.

Answer 2

A conductor will allow electricity to pass through it. Resistors block electricity. the best working example of this is a wire. in the core of the wire, there is a type of conductor, usually a metal. on the outside of the wire is rubber, which keeps people who touch it from being shocked.

Answer 3

Good conductors tend to have lots of loosely-attached electrons that can move about, whereas poor conductors (insulators) have electrons bound up in tight bonds. Electrons in excellent conductors such as metals exist almost as a kind of fluid that flows past the atoms themselves.

Answer 4

If we consider a wire of a certain material (a cylinder much longer than larger) and apply a voltage difference between its extremes we have two possibilities:

- no current flows through the wire up to the moment in which the potential is so high that the very structure of the material is broken by the fact that electrons are extracted from the atoms or molecules by the huge electrical field (called dielectric breakdown). Such a material is called dielectric.

- A current flows through the wire without any damage to the material and it linearly increases increasing the applied voltage, up to a voltage so high that saturation starts, after that breakdown happens as in dielectrics.

Such a material is called conductor.

As far as the voltage is not too high, the current I flowing in a conductor wire depends on the applied voltage V through the law (Ohm's law)

V = (L /(A s) ) I

where A and L are respectively the section and the length of the wire and s is teh so called conductivity, that is a material property. Higher the conductivity, better the conductor.

Metals are usually good conductors, the conductivity for a few metals mesured in Internationall System units (S/m) at 20°C is reported below

Silver

6.30×107

Copper

5.96×107

Gold

4.10×107

Aluminium

3.5×107

Calcium

2.98×107

Tungsten

1.79×107

Zinc

1.69×107

Nickel

1.43×107

Lithium

1.08×107

Iron

1.00×107

Platinum

9.43×106

It is interesting to note that on the other side of the conductivity scale, good insulators have a conductivity of the order of the order of 10^-21 (PET) or even 10^-23 (Teflon) so that the range of conductivity of common materials is as large as 30 orders of magnitude.

Answer 5

Good conductors for electricity? Typically good conductors are metals, but any substance that has free-roaming electrons can make for good conductors, whereas substances with fixed, non-sharing electrons often make for poor conductors.

Answer 6

A conductor better allows electricity to pass through it and an insulator prevents electricity from going through it.

Answer 7

The diffrerence between a good condutor and a bad conductor is that a good conductor it go through electricity but a insulator would not attract electricity .

Answer 8

Good conductors of electricity: silver, cooper, aluminum, gold

Poor conductors of electricity: aluminum oxide, porcelain, rubber, wood