The mechanism of metallic resistance : as temperature increases the thermal vibrations in the lattice increase causing more electron scattering therefore more collisions will take place, slowing down the electron flow. This increases the rate of transfer of electrical energy by heating and increases the electrical resistance.
The semiconductor's electrons also vibrate more at higher temperature so this contributes to resistance increase in the same way as for a metal. So what else could make the semiconductor conduct better? The answer is: more charge carriers. Whereas the number of free electrons in a metal is constant the effect of heating a semiconductor frees additional electrons (and holes). For silicon in this temperature range the effect of additional charge carriers outweighs the effect of additional vibrations, so the overall resistance will decrease with temperature.
When the temperature of a conductor is increased, the amplitudd of vibrations of atoms increases.As a result, the probability of collision of electrons with vibrating atoms increases.That is why, it is said that the resistance of a conductor is increases with increasing temperature
When temperature of metal is raised, kinetic energy of the atoms of its crystal increases, and it is available in form of vibrations. So when electrons flow, the probability of collision with atom increases. Due to this, Resistance increases.
this becos an increase in temp causes the immobile electrons to collide with the conductin electron thereby incresing resistance since conductivity is reduced
Magnetism does not affect the resistance of a conductor. The factors affecting resistance are the conductor's length, cross-sectional area, and resistivity. As resistivity is affected by temperature, temperature indirectly affects resistance. However, the changing magnetic field surrounding a conductor carrying an AC current causes the current to flow closer to the surface rather than being distributed throughout the cross-section of the conductor. The greater the frequency, the greater this effect. This has the equivalent effect of reducing the cross-sectional area of the conductor, causing its resistance to rise. This is misleadingly called the 'AC resistance' of the conductor!
Boron is not a good conductor of electricity at room temperature, but is a good conductor at a high temperature.
No, gold is not the best conductor. At room temperature, silver is a slightly better conductor. The best electrical conductors are the so-called superconductors, which are materials that only exhibit the property of superconductivity at very low (cryogenic) temperatures. When exhibiting the property of superconductivity, they have a resistance of zero.
Reduce the resistance:-- Use a shorter piece of wire.-- Use thicker wire.-- Cool the wire.Increase the resistance:-- Use a longer piece of wire.-- Use thinner wire.-- File a nick in the piece of wire you have.-- Stretch the wire.-- Heat the wire.
The only limit on how much current the conductor can carry, regardless ofthe weather, is the amount of current that causes the conductor to melt.The current in such a conductor depends on the voltage between its ends,and on the resistance of the conductor. The resistance of the conductor issomewhat less when it's cold, so a given voltage would result in more current.
When the temperature of a conductor is increased, the amplitudd of vibrations of atoms increases.As a result, the probability of collision of electrons with vibrating atoms increases.That is why, it is said that the resistance of a conductor is increases with increasing temperature
When the temperature of a conductor is increased, the amplitudd of vibrations of atoms increases.As a result, the probability of collision of electrons with vibrating atoms increases.That is why, it is said that the resistance of a conductor is increases with increasing temperature
as the temperature rises,the drift velocity increases hence relaxation time decreases and resistance increases.
The resistance of a conductor is directly proportional to the resistivity of the conductor. since the resistivity of a conductor is decreases with decrease in temperature hence the resistance.
This depends on the type of conductor. If the conductor has a positive coefficient the resistance will increase. If the conductor has a negative temperature coefficient the resistance will decrease.
The material from which the conductor is made, the length of the conductor, the diameter of the conductor and the temperature of the conductor are all things that impact its resistance.
Magnetism does not affect the resistance of a conductor. The factors affecting resistance are the conductor's length, cross-sectional area, and resistivity. As resistivity is affected by temperature, temperature indirectly affects resistance. However, the changing magnetic field surrounding a conductor carrying an AC current causes the current to flow closer to the surface rather than being distributed throughout the cross-section of the conductor. The greater the frequency, the greater this effect. This has the equivalent effect of reducing the cross-sectional area of the conductor, causing its resistance to rise. This is misleadingly called the 'AC resistance' of the conductor!
I assume you meant pressure to voltage. The resistance of a conductor is directly proportional to the temperature of the conductor. If the temperature of the conductor increases due to increased current, then the resistance tend to increase too.
For metals, as the temperature rises, the atoms wiggle around more, and are more likely to be hit by an electron that is moving through the metal. The more electrons that hit the atoms, the greater the resistance. Think of the wiggling atoms as interfering with the smooth flow of electrons.
increases
It depends on the material. In metals, the resistance increases with temperature.
A thermistor is a temperature sensitive resistor, there are two types: 1) If the temperature rise the resistance will go higher 2) If the temperature rise the resistance will go lower