What is the relation between area and resistance?
Resistance depends on an object’s size, shape, and material. In Figure 3 below, the cylinder’s resistance is directly proportional to its length l. The longer the cylinder, the higher the resistance. Additionally, the resistance is inversely proportional to the cross sectional area A.
What happens to the resistance of a conductor when its area of cross section is increased?
On increasing the area of cross-section, resistance decreases. This is because resistance is inversely proportional to area.
Why does cross sectional area affect resistance?
The larger the cross-sectional area of the conductor, the more electrons per unit length are available to carry the current. As a result, the resistance is lower in larger cross-section conductors. The longer the conductor, therefore, the higher the resistance. Different materials also affect the resistance.
What happens to resistance of the conductor 3 when temperature is increased when area of cross section is increased when length is increased?
The resistance of a conductor decreases with increase in cross-sectional area.
What is the relationship between the length of wire and resistance?
The relationship between resistance and wire length is proportional . The resistance of a thin wire is greater than the resistance of a thick wire because a thin wire has fewer electrons to carry the current. The relationship between resistance and the area of the cross section of a wire is inversely proportional .
What happens to resistance if length is doubled?
What happens to resistance when length is doubled? From the equation, we understand that resistance is directly proportional to the length of the conductor and inversely proportional to the crossectional area of the conductor. Doubling the length doubles the resistance.
Why does resistance increase as length of wire increases?
When electrons start to move, they get scattered from the nuclei present in the material which is the wire made from. This process creates the resistance. Thus, when the length of the wire increases, the amount of particles scattered from the nuclei increases which also increases the resistance.
Does diameter affect resistance?
Resistance is inversely proportional to the square of the diameter of a wire. If diameter is doubled then resistance is reduced by 4 times. Resistace is inversely proportional to the area of conductor ,so with the increasing of the diameter the value of resistance will be decrease.
What will happen to resistance if the length of the conductor is increased?
Answer. the resistance of a conductor is directly proportional to its length. so if length is increased then resistivity increases ande vice versa. so if length is doubled resistance will also get doubled i.e resistance is 4 times that of original resistance.
What happens to the resistance when the length is doubled without affecting the thickness of conductor?
what happens to the resistance when length of conductor is doubled without affecting the thickness of conductor? R = ρl/A. According to this relation, resistance is directly proportional to length of the conductor. Hence, when length is doubled, the resistance will also get doubled.
On what factor does the resistance depends on?
The resistance of a conductor depends on the cross sectional area of the conductor, the length of the conductor, and its resistivity. It is important to note that electrical conductivity and resistivity are inversely proportional, meaning that the more conductive something is the less resistive it is.
What will be new resistance if length of conductor is doubled and thickness is halved?
R’ = 4 * original resistance . hence , the new resistance comes out to be = 4 times of original resistance .
When the length of the conductor is doubled then the resistance will be?
So, R = 2R’. Hence, If the length of a wire is doubled, then its resistance becomes 2 times.
How will the resistance of a conductor change if the length of the conductor is doubled?
The resistance of a conductor is directly proportional to its length (L) as R ∝ L. Thus doubling its length will double its resistance, while halving its length would halve its resistance. Also the resistance of a conductor is inversely proportional to its cross-sectional area (A) as R ∝ 1/A.
What will happen to the resistance of a conductor if its temperature is decreased?
Answer. The specific resistance of a conductor is directly proportional to temperature. It means that if the temperature increases then resistance also increase and if the temperature decreases than resistance also get decreases..
Does resistance decrease with temperature?
The more these atoms and molecules bounce around, the harder it is for the electrons to get by. Thus, resistance generally increases with temperature. In some materials (like silicon) the temperature coefficient of resistivity is negative, meaning the resistance goes down as temperature increases.
Why rise in temperature of a conductor is accompanied by a rise in the resistance?
The resistance of a conductor increases with an increase in temperature because the thermal velocity of the free electrons increases as the temperature increases. This results in an increase in the number of collisions between the free electrons.
What is the relation between resistance and temperature?
As temperature rises, the number of phonons increases and with it the likelihood that the electrons and phonons will collide. Thus when temperature goes up, resistance goes up. For some materials, resistivity is a linear function of temperature. The resistivity of a conductor increases with temperature.
What are the effects of temperature on resistance?
As the temperature increases, some of the electrons acquire energy and become free for conduction. Hence, conductivity increase and resistance decrease with increase in temperature.
Why does higher temperature increase resistance?
Heating a metal conductor makes it more difficult for electricity to flow through it. These collisions cause resistance and generate heat. Heating the metal conductor causes atoms to vibrate more, which in turn makes it more difficult for the electrons to flow, increasing resistance.
What is the resistance of ideal voltmeter?
Infinite
Does higher resistance mean more heat?
A higher resistance produces more heat. The longer the time the larger the amount of heat produced. The amount of current, I. the higher the current the larger the amount of heat generated.