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Q: Why do certain materials have electric resistance?
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Related questions

What will the electric resistance of certain materials know as superconductors to suddenly decrease to essentially zero?

The last three people who posted this question, frankly, did a much better job of copying it from wherever it appeared first.


Why are resistance materials used in toasters?

Because the main purpose of a toaster is to radiate heat. In order to generate heat from electric current, resistance is required in the circuit.


What are crystalline structures that conduct electricity without resistance when cooled to a certain temperature?

Superconducting materials.


How are the magnets able to have zero resistance?

If you mean zero electrical resistance for an electromagnet, this is possible with superconductivity. This can be achieved for certain materials at fairly low temperatures - typically a few kelvin.


Does an electric motor have different resistance than an electric heater?

Yes it would be unlikely an electric motor coincidentally exactly matched the resistance of an electric heater.


What is the difference between a resistance and a capacitor?

resistance refers to the resistance of flow of electric current wile a capacitor is an electric device that stores energy.


What is insulation resistant?

It is the resistance of insulating material in electrical equipment e.g. electric motors, etc., measured in megohms.Some materials like glass, mica and others are classified as insulators because their resistance to the flow of electrical current is very high.The basic unit of resistance is the ohm. A megohm means a resistance equal to 1 million ohms.


What happens to the materials when cooled?

If they get cold enough, they may change their phase; mainly, from gas to liquid, or from liquid to solid. Also, in most cases materials tend to use up less volume when they are cooled. Other properties also change, such as electrical resistance - one interesting case is superconductivity, where certain materials suddenly have ZERO RESISTANCE below a certain temperature.


What is the SI unit for an electric resistance?

The unit for resistance is the Ohm.


What material allows electric current to pass through?

Electric current flows in conducting materials such as metals. The best conductor of electric current is silver, followed closely by copper and then aluminium.


What is a material that will carry an electric current called?

A material that will carry an electric current is called a conductor. Conductor materials have high electrical conductivity, allowing the flow of electric charges with minimal resistance. Examples of conductors include metals such as copper, aluminum, and silver.


What is the unit for measuring electric resistance?

ohms.Ohm is the measurement of resistance. Ω