Why resistance is directly proportional to the length of 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.
Which is directly proportional to the resistance?
The resistance of any conductor is directly proportional to length and inversely proportional to area of cross-section of the substance. As value of resistance(R) is directly proportional to length of resistance, so by increasing the length of resistance the value of resistance increases.
Why is resistance directly proportional to length and inversely proportional to area?
The resistance of a wire is directly proportional to its length and inversely proportional to its cross-sectional area . Resistance also depends on the material of the conductor. ... The resistance of a conductor, or circuit element, generally increases with increasing temperature.
Is resistance directly proportional to temperature?
The resistance increases as the temperature of a metallic conductor increase, so the resistance is directly proportional to the temperature.
Is resistivity directly proportional to resistance?
Resistivity ρ is an intrinsic property of a material and directly proportional to the total resistance R , an extrinsic quantity that depends on the length and cross-sectional area of a resistor. The resistivity of different materials varies by an enormous amount.
Is length directly proportional to resistance?
For a given material, resistance and length formula clearly speaks that the resistance is directly proportional to its length . When the length of the material is increased, its value of resistance also increases. When the length of the material decreases, its value of resistance will also decrease.
What are the factors affecting the resistance?
Ohm’s Law and resistance
length – longer wires have greater resistance. thickness – smaller diameter wires have greater resistance. temperature – heating a wire increases its resistance.
Is resistance directly proportional to voltage?
The relationship between current, voltage and resistance is expressed by Ohm’s Law. This states that the current flowing in a circuit is directly proportional to the applied voltage and inversely proportional to the resistance of the circuit, provided the temperature remains constant.
Why resistance is directly proportional to the temperature?
Resistance of a conductor is directly proportional to temperature. ... With the increase in temperature, vibrational motion of the atoms of conductor increases. Due to increase in vibration, probability of collision between atoms and electrons increases. As a result, resistance of conductor increases.
What is the effect of temperature on the resistance?
The effect of temperature on the resistance of the conductor is directly proportional to each other . The increase in temperature of the conductor increases its resistance and makes it difficult to flow current through it. As discussed above, the movement of free electrons creates the flow of current in the conductor.
What is the relation between temperature and resistance?
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 4 factors that affect resistance?
- The type of material of which the resistor is made.
- The length of the resistor.
- The thickness of the resistor.
- The temperature of the conductor.
What is the relation between resistivity and resistance?
Relation between Resistivity and Resistance is: R=ρlA , where ρ is the resistivity, l is the length of the conductor and A is the cross sectional area. We know that the resistivity of a material depends on the temperature.
Does resistivity affect resistance?
Resistance depends on the resistivity . The resistivity is a characteristic of the material used to fabricate a wire or other electrical component, whereas the resistance is a characteristic of the wire or component.
What is resistance when length is doubled?
So, the new resistance, after doubling the length of the wire, becomes twice of the original resistance . Hence, if the length of a wire is doubled, then its resistance becomes doubled.
Does the length of wire affect resistance?
The resistance of a long wire is greater than the resistance of a short wire because electrons collide with more ions as they pass through. The relationship between resistance and wire length is proportional .
