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there are a couple ways to look at this
easiest is that the increase motion of the metal atoms/molecules makes it more difficult for electrons to find a "path" across the wire.
another way is that it is harder to knock off the inner orbit e-'s at a higher temperature because all the outer ones have been stripped due to molecular bumping at high speed
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∙ 12y ago
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What has more resistance a nichrome wire or a copper wire?
Nichrome wire has such high resistance that it is used to convert electrical energy into heat. Many heating elements are made from nichrome. Copper wire has the best conductivity, for the price, of any metal.
What is difference between 3 wire and 4 wire RTD sensor?
An RTD or Pt100 sensor is connected with two, three or four wires to the measuring device.we learned that we are in fact measuring resistance to determine the temperature. Now when measuring the resistance of the sensing element, we also measure the resistance of the leads and cables used. This gives an error! To compensate for this, the three wire type (bridge) is used, giving enough accuracy in most industrial applications. Even better accuracy is possible with a four wire Pt100 (laboratory applications). Our Pt100 panel mounted indicators have an offset compensation when using two wire sensors.
Is fuse wire characterized by high resistance and high melting point?
Fuse wire is charaterized by high resistance and low melting point to avoid surge of ac current through it.
What is considered a high melting point and what is considered a low melting point?
resistance means the te power to resist the heat or the electric current/ eg: tungsten which is used to make the filament of the bulb has a high melting point even when it burns on a high temperature so it has a high resistance, whereas in the wire of an electrical fuse has a low melting point as it burns at a high temperature...
What is an electrical wire made out of?
Usually copper, but can also be made of aluminum. Copper has a higher melting point and better resistance to corrosion, however is more expensive than aluminum (£1600/tonne)
How does temperature affect resistance of a wire?
If you are asking if a hot wire has a greater resistance than a cold wire then the answer I would say is yes. Cold wires have always had less resistance than hot wires
Does a longer wire equal resistance?
Wire is not equal to resistance. If you have two pieces of wire with the same thickness, composition, and temperature, the longer piece has higher electrical resistance.
Three ways which resistance of a wire can be increased?
You can increase the resistance in the wire, by doing any of the following:Increase the length of the wire.Reduce the wire's cross-section.Change to a material that has a greater resistivity (specific resistance).You can increase the resistance in the wire, by doing any of the following:Increase the length of the wire.Reduce the wire's cross-section.Change to a material that has a greater resistivity (specific resistance).You can increase the resistance in the wire, by doing any of the following:Increase the length of the wire.Reduce the wire's cross-section.Change to a material that has a greater resistivity (specific resistance).You can increase the resistance in the wire, by doing any of the following:Increase the length of the wire.Reduce the wire's cross-section.Change to a material that has a greater resistivity (specific resistance).
Which has the greater resistance thick wire or a thin of the same length?
The thermal resistance of a wire is proportional to ln(r2/r1), meaning that a thicker wire has a greater thermal resistance.
If two wires of the same material have the same thickness but different length the blank wire will have greater resistance?
The thinner the wire, the higher the resistance. The thicker the wire, the resistance decreases. Think of it this way. The thick wire has more room for electrons to jump around, but the thin wire has less room.
Which material has a greater resistance aluminum or copper wire?
Aluminium wire has high resistance than Copper.
How does length affect resistance of a wire?
In general, the longer the wire the greater the resistance. The only time that this is not so is when the wire is a superconductor, in which case the resistance is always zero.
What would reduce resistance in a copper wire?
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.
Explain how the resistance of a wire varies with its length?
The resistance of a wire is a measure of how difficult it is for electricity to flow through the wire. The resistance of a wire is inversely proportional to its cross-sectional area and directly proportional to its length. This means that, all else being equal, the resistance of a wire increases as its length increases. There are several factors that can affect the resistance of a wire, including the type of material the wire is made of, the wire's cross-sectional area, and the wire's temperature. The resistivity of the material the wire is made of is a measure of how easily electricity can flow through the material, and different materials have different resistivities. For example, copper has a lower resistivity than aluminum, so a copper wire will have less resistance than an aluminum wire of the same size and length. In general, the resistance of a wire increases as its length increases because the electrons flowing through the wire encounter more and more obstacles as they travel through the wire. The longer the wire, the more obstacles the electrons must overcome, which increases the resistance of the wire. It is also important to note that the resistance of a wire is not a constant value, and it can change depending on the temperature of the wire. As the temperature of a wire increases, the resistance of the wire also increases. This is because the higher temperature causes the atoms in the wire to vibrate more, which makes it more difficult for the electrons to flow through the wire.
Do thin wires have a greater or lesser resistance to electron flow than do thicker wires?
Thinner wire has greater resistance than thicker wire, assuming the same amount of current.
The magnitude of the resistance of a wire depends on?
Temperature, Length of wire, Area of the cross-section of wire and nature of the material.
Suppose you have two wires of equal length made from the same material how is it possible for the wires to have differents resistances?
You don't specify diameter. I am assuming it is the same. However, the larger the wire the lower the resistance. Temperature affects resistance. The hotter the wire, the higher the resistance. You also don't specify the layout of the wire. For example you could make a coil or choke with one wire.
