In order for electricity to flow in a circuit, it must have a complete "loop," or path, through which to flow. In a battery-powered circuit, this loop must connect the positive end of the battery (marked with a "+" symbol) to the negative end of the battery (indicated by a "-" symbol, but this is usually not printed on the battery). This is called a closed circuit, as...
Copper, Brass, Steel, Gold, and Aluminium are good conductors of electricity. We use them in electric circuits and systems in the form of wires. Mercury is an excellent liquid conductor. Thus, this material finds use in many instruments. Gases are not good conductors of electricity because the atoms are quite far away.
Materials which do conduct electricity, like copper, are called conductors. In the middle are materials known as semiconductors, which don't conduct as well as conductors, but can carry current.
Metals are examples of this type of material and many metals are good electrical conductors. Although silver is the best conductor of electricity, it is very expensive. Copper is almost as good a conductor and much cheaper than silver, so copper wiring is often used in electrical appliances and to conduct electricity from one place to another.
Conductors. A conductor is a material that provides little opposition to the flow of electrons (current). Because the resistance of a conductor is low, very little energy is required to generate current through it. Thus, the materials with the lowest resistance make the best conductors.
Properties of conductors. In this part of the course, we assume conductors to be perfect conductors. This is a good approximation for many real-world materials, especially metals such as copper, silver, aluminum, iron, etc. There is no electric field inside a conductor. If you try to make a field inside, the charges in the conductor move around ...
Stone and glass are better thermal conductors than air, and so they feel cold, too. This works the other way when we encounter a sun-warmed seat belt buckle -- now energy flows from the metal, again because it is a good conductor, to us, and if it's really hot, we get burned. The opposite of a thermal conductor is a thermal insulator.
Charges exist only on the surface of a conductor. Otherwise, there would be electric fields inside. All points of a conductor are at the same potential. Since DV=-EDx, since E=0, the potential must be constant. Conductors are materials such as copper, aluminium, silver...
A semiconductor material has an electrical conductivity value falling between that of a conductor, such as metallic copper, and an insulator, such as glass.Its resistivity falls as its temperature rises; metals are the opposite. Its conducting properties may be altered in useful ways by introducing impurities ("doping") into the crystal structure.When two differently-doped regions exist ...
Semiconductors are used extensively in electronic circuits. As its name implies, a semiconductor is a material that conducts current, but only partly. The conductivity of a semiconductor is somewhere between that of an insulator, which has almost no conductivity, and a conductor, which has almost full conductivity. Most semiconductors are crystals made of certain materials, […]