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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
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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 special features of SI units compared to other unit of measurements?
compare to otherunits, the lenght, with, and with
How does the resistance of a wire vary with its lenght?
The resistance of a wire increases as its length increases. This is because as the length of the wire increases, there are more atoms for the electrons to collide with as they pass through the wire, leading to more opposition to the flow of electric current and a higher resistance.
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.
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
Which factor does not affect the resistance of a conductor?
Bodies directly surrounding the body (Penn Foster)
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.
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
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
A lenght of cirular wire as a resistance of 1 ohms if its the diameter was double its resistance woul be.?
If the diameter of the circular wire is doubled, the resistance will decrease by a factor of four, resulting in a resistance of 0.25 ohms. Resistance is inversely proportional to the cross-sectional area of the wire, which is affected by the diameter.
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.
How is mechanical advantage calculated for levers?
The mechanical advantage of a lever is calculated by dividing the length of the lever arm on the effort side by the length of the lever arm on the resistance side. The formula for mechanical advantage is MA = Length of effort arm / Length of resistance arm. It represents the factor by which a lever multiplies the force applied to it.
