What is the resistance of a conductor?
Resistance is the opposition to the flow of electrons (i.e. electrical current) in a conducting material such as a metal wire or a pair of contacts in a switch. Every substance has a certain amount of resistance. Resistance is measured in ohms. If one volt can push 1 amp of current through a substance, it has a resistance of 1 ohm. Some materials, like copper and aluminum have fairly low resistance, and are therefore used as electrical conductors (wires).
Conductor resistance means a material's opposition to the flow of current that a conductor has. Ideally, in a wire, this should be nothing, i.e. 0 ohms, but in reality all conductors have a certain amount of resistance. For example, 1000 feet of 14 AWG (the common wire size used for 15 amp branch circuits in residential wiring in North America) has about 2.5 ohms of resistance.
Think of a conductor as a resistor/resistance of a certain very low value in series with whatever load it is feeding. Current flowing through the conductor(s) will result in a voltage drop and power loss, manifested as heating of the conductors. The "line loss" formula is one variation of the power formula and is P = I2 x R, which can be used for calculating the power loss in the conductors. Remember that any power line to a 120 volt device has 2 lengths of conductor going to it (hot and neutral return). Therefore the total conductor length is the length of the power cord or electrical cable times 2.
To calculate the voltage drop across the conductor resistance for a given current, you have to determine the conductor's resistance and use Ohm's law.
Calculating the resistance of a length of conductor can be done using tables readily available in textbooks or via a websearch, assuming copper conductors at 20 degrees Celcius. You need to know the size of the conductor (AWG size, for American wire gauge) and the length of the conductor.
If A conductor has a resistance of 0.8 ohms what will happen to its resistance if the temperature is decreased?
In the general sense, a conductor's resistance is usually in the milliohm to low ohms range, whereas an insulator's resistance is in the megohm range. For an insulated conductor, the resistance of the conductor is directly proportional to its length, whereas its insulation resistance is inversely proportional to the length of the conductor.
Resistance R =p(L /A) i,e Resistance(R) of a conductor will be directly proportional to its length(L) ==> if the length of the conductor increases its resistance also will increase. i,e Resistance(R) of a conductor is inversely proportional to its cross section area(A) ==> if the Area of the conductor increases its resistance also will decrease.
As the length of a conductor decreases so does the resistive value of the conductor. Conductors are rated in ohms per foot. To find the resistance of a conductor multiply the ohms/foot by the length of the conductor. As the ohmic value of the conductor increases so does the voltage drop on the conductor due to the resistance of the conductor. At a point the conductor has to be increased in circular size to bring…
Conductors have low resistance. Recall Ohm's law. The higher the conductor resistance, the greater the voltage drop along the conductor, and the less voltage that is available for the load. The conductor resistance is a resistance in series with the load. Also, higher conductor resistance results in more electrical power being converted into heat, warming up the conductors. This is calculated with the formula P=I2R. The greater the resistance, the greater the power wasted heating…
Low resistance. Answer Since resistance is inversely proportional to the cross-sectional area of a conductor, increasing the diameter ('thickness') of a conductor will reduce its resistance. For example, doubling the diameter of a circular-section conductor will quadruple its cross-sectional area, and reduce its resistance by one quarter.
here, we know that both semiconductor and conductor used to conduct electricity but ,the difference is in there conductivity.and resistance , in conductor if we increase its temperature its resistance increase but in semiconductor its vice versa.that is if temprature rises its resistance will decreases.....
Ways to reduce electrical resistance: increase the diameter of the conductor, decrease or increase the temperature of conductor (depending on its thermal characteristics), decrease the length of the conductor. A change in the material out of which the conductor is made can decrease resistance, too. And there is the phenomenon of superconductivity. In a simple circuit the resistance can be lowered by adding resistors in parallel. The total circuit resistance will then decrease. You can…
Resistance is affected by the length, cross-sectional area, and resistivity of the conductor. The resistivity, in turn, is affected by temperature. So only by changing one of these four factors will the resistance of a conductor change. Changing voltage will have no affect upon the conductor's resistance.
A component of a given size that offers low resistance is called a good conductor. A conductor having some appreciable resistance is called a resistor. A component of identical size that offers a higher resistance is called a poor conductor. An insulator of the same size offers even higher resistance.