Quick Answer: What Causes Resistance In A Metal?

Do metals have high or low resistance?

In fact, we think of metals as having a large population of free electrons in the conduction band all the time.

So the application of electric potential will cause them to move – a current flow.

So, metals generally have a relatively low (though not zero) resistance..

What causes high resistance?

The higher the resistance, the lower the current flow. If abnormally high, one possible cause (among many) could be damaged conductors due to burning or corrosion. … The lower the resistance, the higher the current flow. Possible causes: insulators damaged by moisture or overheating.

What affects a material’s resistance?

How much resistance a material has depends on several factors: the type of material, its width, its length, and its temperature. … Materials such as metals have low resistance to electric current. They are called electric conductors. A wide wire has less resistance than a narrow wire of the same material.

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.

Which metal resistance decreases with increase in temperature?

In insulators and partial conductors such as carbon, increase in temperature results in decrease in resistance. Thus semiconductors or insulators are said to be in negative temperature coefficient of resistance.

Does resistance depend on temperature?

Since the resistance of some conductor, such as a piece of wire, depends on collisions within the wire itself, the resistance depends on temperature. With increasing temperature, the resistance of the wire increases as collisions within the wire increase and “slow” the flow of current.

How does the type of metal affect resistance?

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.

Why does the resistance of metal increase with temperature?

Resistance. … If the temperature of the metal is raised the atoms vibrate more strongly and the electrons make more violent collisions with them and so the resistance of the metal increase (see later).

What are the 4 factors that affect resistance?

There are 4 different factors which 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.