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Why the resistance is directly proportion to the lenght of a conductor?
Wiki User
∙ 11y ago
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
Wiki User
∙ 15y ago
Wiki User
∙ 11y agoOhm law: R = rho * Length / cross section
rho [Ohm m] resistivity (material parameter)
Length [m]
cross section [m^2]
R [Ohm]
It can be shown it comes directly from E = rho J (E: electrical field, J current density), EM fields balance law.
You could imagine electrons and conductors like cars in a highway. the more you travel, the most fuel you will consume.
what made you consume fuel is friction and road slope, that is resistance.
Wiki User
∙ 6y agoA longer piece of wire has more resistance than a shorter piece of that same wire. A thicker piece of wire will have less resistance than a thin piece of that same wire that is the same length.
Wiki User
∙ 11y agoThe resistance of a piece of wire is directly proportional to its length.
For example, 80-ft of wire has double the resistance of 40-ft of the same material.
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The resistance of an extension cord varies directly with the length of the cord?
This means that as the length of the extension cord increases, the resistance also increases. Similarly, if the length decreases, the resistance will decrease as well. This relationship is described by the equation R = kL, where R is the resistance, L is the length, and k is a constant.
Which factor does not affect the resistance of a conductor?
Bodies directly surrounding the body (Penn Foster)
What are the SI unit of lenght?
10936
What is the lenght of a bus?
The average length of a bus is around 45 ft.
What is the basic metric unit of lenght?
The meter, also spelled metre.
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.
The resistance of an extension cord varies directly with the length of the cord?
This means that as the length of the extension cord increases, the resistance also increases. Similarly, if the length decreases, the resistance will decrease as well. This relationship is described by the equation R = kL, where R is the resistance, L is the length, and k is a constant.
What three things effect the value of the applyed voltage in a conductor?
Lenght, diameter and material of the conductor.
Why does a 3 pin plug have big ground pin?
Resistance =pl/a where a is "area". And area is directly propotional to lenght and thickness. so if the area is greater mean resistance is less. and resistance is inversly proptional to current. so it will act as low resistance path for neutral current.
Which factor does not affect the resistance of a conductor?
Bodies directly surrounding the body (Penn Foster)
20 The magnitude of the voltage induced in a conductor moving through a stationary magnetic field depends on the and the of the conductor?
speed and lenght
A lenght of cirular wire as a resistance of 1 ohms if its the diameter was double its resistance woul be.?
Its resistance would be half , 0.5 ohms is the answer.
How can the resistance of a conductor be determined?
Assuming copper conductor at 20 degrees celcius, you can use a chart to determine the resistance of a length of conductor. You must know it's size (AWG, for American wire gauge) and the look up the resistance per 1000 feet from any table. For a specific length of conductor, you just multiply the table's value by the proportion of 1000 feet that's actually the lenght of the conductor: table's resistance value x length in feet/1000 feet. For other temperatures or materials (i.e., aluminum), you must use a different formula: Rc = (K x L)/cmil where Rc = conductor resistance, K = "K factor" (see below), L = length of conductor and cmil is the cross sectional area of the conductor in circular mils (see the same chart referred to above). The K factor for different materials is Copper: 10.8@25OC, 11.8@50OC and 12.9@75OC Aluminum: 17.0@25OC, 19.0@50OC, 21.2@75OC The K factor is the resistance of one circular mil-foot (cmil-foot) of the material. A mil is 0.001" and a circular mil is a circle 1 mil in diameter. A circular mil-foot is a length of the material 1 circular mil in cross-sectional area and 1 foot long. The cmil value of a given wire gauge is the cross-sectional area in circular mils.
How would you find out the length of the wire effects the voltage drop across the wire when the current passing is kept constant?
A: There are tables that qualify IR drops for wire lenght. All wire do offer resistance to current this current will cause directly a volatge drop according to the wire resistance so it can be measured to find the IR drop
What in the cable limits signal degradation?
A: As cable lenght increases the impedance changes with frequency especially at half wave lenght where at some frequency the impedance can be zero. The impedance is a function of capacitance inductance and resistance in the cable
Why is electricity related to voltage?
Because voltage is the power that makes electricity to circulate in a wire. Depending on the diameter, the lenght and material of the conductor (wire) the current, (the amount of electrons) flowing in the wire, the resistance will be lower or higher. Conclusively, the voltage is not the electricity itself, but it is like a pump that impulses the water through a pipe. Electricity is the current whose unit of measurement is the Ampere. So you have the voltage, resistance, and current in a electrical circuit on a direct current system.
What is the relationship between the size of an electric current passing through a lenght of wire and its heating effect?
The higher the current, the more heat generated. Also, the smaller the diameter of the wire, the higher the heat. It is important to choose the correct amperage rating of the wire to prevent fires.Another AnswerThe work done by an electric current is the product of the square of that current, and the resistance of the conductor. The resulting heat depends upon the difference between the temperature of the conductor and that of the surrounding air. Remember, heat is defined as the transfer of energy between objects at different temperatures.
