0
Why electrical resistivity of metals change with increasing laser shots?
Wiki User
∙ 10y ago
it is similar to that of heating a metal
heating a metal leads to increase in resistance
thus both laser shot or heating are form of heat transfer that leads the atoms to higher energy states causing random movement of electrons vigorously which increases resistance
Wiki User
∙ 10y ago
Add your answer:
Earn +20 pts
What combination of factors is most suitable for increasing the electrical conductivity of metals?
Resistivity is a constant for any particular material, and independent of that material's physical dimensions or shape. However, it does vary with temperature which is why resistivity is always quoted at a particular temperature. Variations in resistivity due to temperature change is the reason that the resistance of a material varies with temperature. In SI, resistivity is expressed in ohm metres.
What factor should change in electrical conductivity of metals and non metals?
Electrical conductivity depends on temperature.
Why does nichrome get hot?
Nichrome has a high electrical resistivity.
How does temperature affect metals?
Temperature affects metals in several ways:they expand with increasing temperaturetheir electrical resistance changes - we expect their resistance to increase with increasing temperaturetheir mechanical properties (such as ductility, hardness. tensile strength, yeild stress, etc) change - for example usually becoming softer and more ductile with increasing temperaturesome metals will undergo solid state phase changes with changes in temperature - especially alloys
Why Alloys of metals have greater resistivity than their constituents?
Resistance is due to scattering of conduction electrons. A metallic crystal can be viewed simplistically as a periodic array of ions with a cloud of delocalised conduction elections. The electrons do not scatter of the ions themselves because the crystal is periodic. There are two significant causes of scattering: 1. scattering off vibrations of the atomic lattice (phonons). This contribution to the resistivity is proportional to temperature. 2. scattering off defects in the crystal. At low temperature, this is the cause of a finite 'residual resistivity'. The two terms add linearly Rtotal = R1(T) + R2 Cold working a metal will introduce defects and thus lead to an increase in R2. Conversely, annealling the metal at high temperature will remove defects and reduce the residual resistivity.
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.
What happens to metal at 200 degrees Celsius?
At 200 C:-- All metals become hot to the touch.-- The electrical resistivity of all metals becomes greater than at room temperature.-- The volume of all metals becomes greater than at room temperature.-- Some metals, but not all, melt (become liquid).
Is metal low conductivity?
No, metals have high conductivity but has low resistivity.
What would make a good electric insulator?
An electrical insulator is a material whose internal electric charges do not flow freely. Rubber, glass, paper, and Teflon, which have high resistivity, are very good electrical insulators.
Can yttrium conduct electricity?
All metals are conductive; the resistivity of yttrium is 596 nanohms.m.
Why is resistivity of a semiconductor higher than that of a metal?
Resistivity is the resistance, in ohms, between the opposite faces of a 1-metre-cube of a material. For metals, resistivity is in the region of 0.0000001 ohm-metre. For semiconductors, it is much higher - it is in the region of 0.01 ohm-metres.
How does the electrical and heat conduction of metals and non metals compare?
Electrical and heat conduction is much greater in metals than in non metals.
