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What is the resistivity of copper at 77 K?
The resistivity of copper at 77 K is approximately 1.7 x 10^-8 ohm-meters. At lower temperatures, the resistivity of copper decreases due to reduced scattering of electrons by lattice vibrations.
What is the impact of the flow of current through a wire on its conductivity and resistance?
The flow of current through a wire increases its conductivity and decreases its resistance.
When the distance between the objects decreases the electrical force increase or decreases?
When the distance between objects decreases, the electrical force between them increases. This is because the force of attraction or repulsion between charged objects is inversely proportional to the square of the distance between them, following Coulomb's law. Thus, as the distance decreases, the force strengthens.
Why does conductivity decrease with temperature?
Conductivity decreases with temperature because as temperature rises, atoms and molecules vibrate more vigorously, disrupting the flow of electrons and reducing the ability of the material to conduct electricity.
Why does the electrical conductivity of pure metal decrease with temperature while that of semiconductors increases?
The conductivity depends on the passage of charged particles especially electrons. In metals electrons are easily available in conduction band and so its conductivity is high. As we increase the temperature then core of atoms vibrate largely. So with positive charge it could easily minimize the electrons in the conduction band and hence fall in conductivity In case of semiconductor there will be usually forbidden gap between valence band and conduction band. So conduction is poor at ordinary temperature. But as we increase temperature that would allow electrons to reach conduction band as covalent bonds get broken. Hence higher conductivity
If the electrical conductivity in an electrical circuit decreases then the birghtness of the light bulb does what?
It decreases
If the electrical conductivity in an electrical circuit decreases then the brightness of the light bulb does what?
Then the brightness of the light buld increases.
When a soluble metallic salt is added to water its electrical conductivity decreases?
No. Its electrical conductivity increases because the positive and negative ions of the salt dissociate in the water.
What is a light dependent resister?
As light falls on the conductor then emission of electrons would increase the conductivity and so its resistivity decreases. Such a conductor is known as light dependent resistor.
How does resistivity vary if length and area are doubled?
if length is doubled then resistivity increases&when area is doubled resistivity decreases.
What characteristics do ionic liquids have?
Such liquids have high density, good electrical conductivity and become solid as temperature decreases from their melting point.
What is the difference between metal and semiconductor?
A semiconductor's resistivity decreases with increasing temperature. A metal's resistivity increases with increasing temperature.
Which conducts electricity better a hot piece of steel or a cold piece of steel?
The electrical conductivity of a metal generally decreases with increasing temperature. Inversely, the electrical conductivity of a semi-conductor increases with increasing temperature.Source: UK GCSE (high school) science education.
What happen to electrical conductivity down the group in a periodic table?
The organization of the periodic table in terms of conductors of electricity could also be said to be the organization of the periodic table in terms of metallic character, since metals are the best conductors of electricity. Metallic character decreases across a period and increases down a group.
Why is water the enemy of insulation?
Water decreases the overall thermal performance of the insulation, also water may just short circuit around the insulation and render it useless.Water, if present on dielectric surface, due its high conductivity decreases the surface resistivity of the dielectric, thus causes high creepage current (surface current).
Why does a pure metal have superior conductivity compared to an alloy?
Copper is a pure metal while kanthal is an alloy. An alloy is a material consists of mixture of two or more elements that are metals and nonmetals. Therefore, kanthal alloy is a metal with addition of some alloy elements such as iron, chromium and aluminum. The addition of alloy elements to pure metals caused additional scattering of the conducting electrons and thus increase the electrical resistivity of pure metals. As the temperature increases, the resistivity of copper increases while the resistivity of kanthal alloy decreases.
If A conductor has a resistance of 0.8 ohms what will happen to its resistance if the temperature is decreased?
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.
