The resistance of an object depends in large part on the material it is made of. Objects made of electrical insulators like rubber tend to have very high resistance and low conductivity, while objects made of electrical conductors like metals tend to have very low resistance and high conductivity.
What factors affect electrical resistance?
There are several factors that affect the resistance of a conductor;
- material, eg copper, has lower resistance than steel.
- length – longer wires have greater resistance.
- thickness – smaller diameter wires have greater resistance.
- temperature – heating a wire increases its resistance.
What determines the level of electrical resistance?
First, the total length of the wires will affect the amount of resistance. The longer the wire, the more resistance that there will be. … More collisions mean more resistance. Second, the cross-sectional area of the wires will affect the amount of resistance.
What 3 things does electrical resistance depend on?
The resistance of a given piece of wire depends of three factors: the length of the wire, the cross-sectional area of the wire, and the resistivity of the material composing the wire. To understand how this works, think of water flowing through a hose.
What are the factors to determine the resistance?
There are four factors affecting resistance which are Temperature, Length of wire, Area of the cross-section of the wire, and nature of the material. When there is current in a conductive material, the free electrons move through the material and occasionally collide with atoms.
How can you reduce the resistance of a wire?
Changing the material, increasing the cross section area, lowering the temperature, and using a thicker wire are some of the ways to reduce resistance.
Is resistance dependent on current?
Resistance is the property of the material and does not depend upon current and potential difference. It only depends upon the length, cross-sectional area, and material used in it.
Why is electrical resistance important?
Resistance is another important property that can be measured in electrical systems. … The same is true with electricity. Materials with low resistance let electricity flow easily. Materials with higher resistance require more voltage (EMF) to make the electricity flow.
What factor does not affect resistance?
The resistance of a conductor does not depend on Pressure.
So it depends on the material. It is inversely proportional to the cross-sectional area of the wire. The r esistance is directly proportional to the length of the wire and resistivity of the material used in making the wire.
Which change decreases the resistance of a piece of copper wire?
Resistance decreases as copper (or any other metal) is cooled. Its atoms vibrate less, and so they impede the flow of electrons less. Pure copper has less resistance than copper containing impurities. Impurity atoms are a different size to copper atoms, so they get in the way of moving electrons.