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Assuming the wire follows Ohm's Law, the resistance of a wire is directly proportional to its length therefore doubling the length will double the resistance of the wire. However when the length of the wire is doubled, its cross-sectional area is halved. ( I'm assuming the volume of the wire remains constant and of course that the wire is a cylinder.) As resistance is inversely proportional to the cross-sectional area, halving the area leads to doubling the resistance. The combined effect of doubling the length and halving the cross-sectional area is that the original resistance of the wire has been quadrupled.

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14y ago
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13y ago

Resistivity of a wire of a certain material is independent of the wire's length. The only thing that would change is resistance. Since R=ρ/A, in the case of length doubling, resistance will also double.

Resistance (R, Ω)

Resistivity (ρ, Ω m)

Length (, m)

Cross surface area (A, m²)

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12y ago

If you go from one piece of wire, to another piece of the same kind of wire that's

three times as long, the triple-length piece will have triple the resistance of the

short piece.

If you just stretch the original wire to triple its original length, then all bets are off.

Its resistance will definitely increase, and will be at least triple, but it could be more

than that.

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14y ago

is doubled, R1 + R2 +R3 + Rn = Rtotal therefore 2 X Rwire= 2 X Rtotal

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12y ago

Wire resistance is measured in ohms per unit length. So increasing the length increases the resistance.

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10y ago

Nothing. Resistivity, expressed in ohm metres, is a constant for any particular conductor although it is affected by temperature.

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7y ago

Doubling the length of a wire doubles the resistance value of the wire. It is equivalent to placing resistors in series where the total resistance value is the sum of all the resistors.

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9y ago

resistance doubles

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Q: Why doubling the length of a wire will double its resistance?
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What is the relationship between wire size length of run and voltage drop?

The wire resistance is proportional to the length of wire divided by its cross-section area. The voltage drop is proportional to the resistance times the current.


How does the material of wire affect the resistance?

Basic: The larger the diameter the less resistance.Deep:R = p (L / A)The resistance is proportional to the length of the wire divided by its cross-sectional area. p is the resistivity of the material in question and varies greatly. Since area (assuming a circular wire) is A = pi * r2 the larger the diameter of the wire the lower its resistance will be.AnswerResistance is inversely proportional to the square of the diameter. So, if you double the diameter, you will quarter the resistance. If you halve the diameter, you will quadruple the resistance.


How bright is the bulb when a shorter wire is used?

Depending on the length of the wire difference between the shot and long wire, in technical fact the bulb would be brighter if a shorter wire was used, but not that much brighter. Energy is used up as it travels along wires.


Why the resistance is directly proportion to the lenght of a conductor?

Resistance is caused due to the collision of the moving free electrons in a conductor with the fixed positive ions in the metal when a potential difference is applied across the conductor. As the length increases, the number of collisions by the moving free electrons with the fixed positive ions increases as more number of fixed positive ions are present in an increased length of the conductor. As a result, resistance increases. -Sanjay


Does the length of the wire affect the brightness of the bulb?

Wire has a certain amount of resistance. As electricity flows down the wire, some of the voltage is lost in the wire before reaching the lamp. So, the longer the wire, the less voltage the lamp gets, and the dimmer it will be.

Related questions

What is the Change in resistance of wire when its length is double?

Assuming the wire follows Ohm's Law, the resistance of a wire is directly proportional to its length therefore doubling the length will double the resistance of the wire. However when the length of the wire is doubled, its cross-sectional area is halved. ( I'm assuming the volume of the wire remains constant and of course that the wire is a cylinder.) As resistance is inversely proportional to the cross-sectional area, halving the area leads to doubling the resistance. The combined effect of doubling the length and halving the cross-sectional area is that the original resistance of the wire has been quadrupled.


Which is a better conductor between a short wire and long wire?

Double the length is double the resistance. Resistance of a wire is the resistivity of the material, times the length, divided by the cross-section area.


How does the resistance of a wire vary with its length?

resistance of wire increases with increases of length


What is the Change in resistivity of wire when its resistivity is doubled?

Resistivity of a wire of a certain material is independent of the wire's length. The only thing that would change is resistance. Since R=ρ/A, in the case of length doubling, resistance will also double.Resistance (R, Ω)Resistivity (ρ, Ω m)Length (, m)Cross surface area (A, m²)


How does the length of a wire affect the resistance?

Yes, resistance is directly proportional to the length, and inversely proportional to the cross sectional area. R = p*l/A. Where R is the resistance of the piece of conducting material, p is Greek letter rho, representing the resistivity of the material, l (lower case L) is the length, and A is the area.


What is one thing that you could do to the wire used in a circuit to decrease the amount of resistance bulb by the wire?

Use thicker wire. Doubling the diameter gives one quarter the resistance.


How does the resistance of a wire vary with its lenght?

If the wire's cross-section area is constant, then its resistance per unit length is constant, and the total resistance should be directly proportional to the length of a wire segment.


What happens to the current of the wire when the length increases?

resistance is directly proportional to wire length and inversely proportional to wire cross-sectional area. In other words, If the wire length is doubled, the resistance is doubled too. If the wire diameter is doubled, the resistance will reduce to 1/4 of the original resistance.


How does a resistance of a wire depend on its radius?

Resistance is inversely-proportional to the cross-sectional area of a conductor. For example, doubling its cross-sectional area will halve its resistance, while halving its cross-sectional area will double its resistance.Since the cross-sectional area of a circular-section conductor is proportional to the square of its radius, doubling that radius will reduce its resistance by one quarter, while halving its radius will quadruple its resistance.


What happens to the electric current in a wire when voltage is increaced?

If the load resistance is constant, then increasing the voltage will increase the current by the same proportion -i.e. doubling the voltage will double the current.


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).


What is the equation for the length and resistance of a wire?

R = (density)(Length)/(Area) Unit of resistance is Ohms.