Molly Ayala
A conductor is a material or object that allows the transfer of electric charge or electrical current. In other words, it is a substance that enables the transmission of electrical power or signals from one point to another. In electrical circuit systems, a conductor is the piece that transports electrical current from the source to its load. Conductors are typically made of metal, with common examples including copper, silver, and aluminium. The choice of conductor material depends on factors such as conductivity, mechanical strength, cost, and application requirements.
| Characteristics | Values |
|---|---|
| Definition | A conductor is a material that allows the flow of electrical charge with little resistance |
| Examples | Common conductors include metals such as copper, aluminum, and silver |
| Properties | Good conductors have high electrical conductivity, which means they offer low resistance to the flow of electric current |
| Uses | Conductors are essential in electrical wiring, transmission lines, and any application where efficient transfer of electrical energy is required |
| Behavior | In a conductor, the electrons are free to move, which allows the flow of electric charge |
| Temperature Effect | Conductivity of conductors generally decreases with increasing temperature |
| Impurities | The presence of impurities or defects in a conductor can affect its conductivity |
| Superconductivity | Some conductors, known as superconductors, exhibit zero electrical resistance below a critical temperature |
| Skin Effect | In conductors, the flow of current is often highest near the surface due to a phenomenon called the skin effect |
| Electric Field | Inside a conductor at electrostatic equilibrium, the electric field is zero |
| Work Function | Conductors have a low work function, which means that electrons can be easily emitted from their surface |
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What You'll Learn
Metals are the most common conductors
A conductor is a material that allows the free flow of electric current. In an electrical circuit system, a conductor is the piece that transports the electrical current from the source to its load. Metals are the most common conductors, with metallic bonding being the reason behind their conductive properties. Metal atoms are surrounded by a large, constantly moving body of electrons that are not linked to a specific atom. These delocalized electrons can repel and move in the direction of an electric current, conducting electricity throughout the metal.
Most metals conduct electricity to a certain extent, but some are more conductive than others. Silver, for instance, is the best conductor of electricity due to its higher number of movable atoms (free electrons). However, silver is expensive and is reserved for specialized equipment like satellites or circuit boards. Copper is the second-best conductor and is commonly used in household appliances and electrical wiring due to its high conductivity, affordability, and ease of fabrication.
Other good conductors of electricity include gold, steel, brass, aluminum, and iron. Gold is highly corrosion-resistant and is used in jewelry, electrical contacts, and electronic circuit boards. Brass is an alloy of copper and zinc that is easy to bend and mold, making it suitable for smaller machines. Bronze, another alloy, is also a good conductor. Iron is a good conductor due to its metallic bonds, which allow electrons to move freely among multiple atoms.
Conductive metals are essential for various applications, from batteries and power lines to electrical wiring and circuit breakers. They are also used in specific industries such as electronics, telecommunications, and aerospace. The choice of metal as a conductor depends on factors such as conductivity, cost, ease of fabrication, and the specific requirements of the application.
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Silver is the best conductor
A conductor is a material that enables the free flow of electric current from the source to its load. Metals are the most common conductors and are used in electric wires.
Silver is the best metallic conductor of electricity. It contains a higher number of movable atoms (free electrons) than other metals, and the more free electrons in a metal, the greater its conductivity. Silver has a conductivity of 6.2×10^7 S/m. However, silver is also expensive and readily corrodes. It is reserved for use in specialized equipment like satellites or circuit boards.
Copper is the second-best conductor with a conductivity of 5.9×10^7 S/m. It is far cheaper than silver and does not corrode, making it the most common material for wiring. Gold is a popular choice for electrical contacts and connectors despite being a worse conductor than both silver and copper. Gold has a conductivity of 4.5×10^7 S/m but does not tarnish or corrode under most circumstances. Its ductility allows it to form more surface area for connections.
Other metals that can act as conductors include aluminium, steel, brass, and iron. The effectiveness of a conductor can be altered by factors such as temperature, impurities, and crystal structure.
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Copper is the most widely used
A conductor is a piece of an electrical circuit system that transports electrical current from the source to its load. Metals are the conductors of choice in electric wires due to their conductive properties, with silver being the best metallic conductor. However, copper is the most widely used conductor.
Copper has been used in electrical wiring since the invention of the electromagnet and the telegraph in the 1820s. Copper is a good conductor of electricity because it has 29 readily available electrons in each atom, which can move freely in an electric field. Copper's high thermal conductivity allows it to distribute heat and reduce any localized overheating, thus lowering the overall temperature. This makes it ideal for power transmission, power distribution, and telecommunications. Copper is also used in power generation, electronics circuitry, and various electrical equipment.
Copper is commonly used for building wire because of its conductivity, strength, and reliability. It requires less insulation and can be installed in smaller conduits than lower-conductivity conductors. Copper building wire is compatible with brass and quality-plated screws, providing connections that won't corrode or creep. Additionally, copper can be plated with a thin layer of another metal, such as tin, gold, or silver, to reduce oxidation, prolong wire life, and facilitate soldering.
While aluminium is a cheaper and lighter alternative, it is a less efficient conductor than copper. Aluminium connections can loosen over time due to their inherent slow creep, high resistivity, and heat generation from aluminium oxidation at joints. Furthermore, aluminium has a lower melting point than copper, making it more susceptible to softening in short circuit conditions.
Copper's combination of physical, electrical, and cost performance makes it a popular choice for electrical conductors. It offers high conductivity, strength, and flexibility, making it suitable for various applications, from building wiring to power cables.
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Conductivity and resistance
Conductors are materials that allow the free flow of electric current. Metals are the most common conductors, with copper being the most widely used due to its excellent conductive properties and relatively low cost. Silver is the best metallic conductor but is rarely used due to its high price.
Electrical conductivity is the ability of a material to conduct an electric current. It is measured in Siemens per meter (S/m) or milliSiemens per meter (mS/m). The higher the conductivity, the lower the resistance, and the more easily current flows through the material. Metals, in general, have high conductivity due to their lattice structure, which allows electrons to move freely.
Electrical resistance is a measure of how strongly a material opposes the flow of electric current. It is the reciprocal of electrical conductivity and is measured in ohms (Ω). Materials with high resistance are called insulators, and those with low resistance are conductors. The resistance of a material depends on its composition, size, shape, and temperature. For example, a long, thin wire has higher resistance than a short, thick wire of the same material.
Resistivity is a property of a material that measures its electrical resistance. It is the inverse of conductivity and is represented by the Greek letter rho (ρ). The SI unit of resistivity is the ohm-meter (Ω⋅m). Resistivity is influenced by the material's microscopic structure and electron configuration. For instance, rubber has high resistivity because its structure prevents the flow of electrons, while copper has low resistivity, allowing a large current to flow even with a small electric field.
Conductance is the reciprocal of resistance and measures how easily an electric current passes through a material. It is measured in Siemens (S), previously called 'mho' (℧). Like resistance, conductance depends on the material's composition, size, shape, and temperature.
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Conductor applications
In electrical terms, a conductor is a material that allows electricity to flow through it with ease. Conductors are used to transport electrical current from the source to its load in an electrical circuit system.
Conductors have a wide range of applications, including:
Electrical Wires and Cables
One of the most common applications of conductors is in electrical wires and cables. These wires and cables are used to transmit electrical power over long distances, from power plants to our homes, and within our homes to power various appliances. Copper is the most commonly used material for these conductors due to its high conductivity and ease of connection through soldering or clamping. However, aluminium and silver are also used in some cases. For instance, aluminium is often used in combination with copper for home internal wiring.
Consumer Charging Cables
Conductors are essential in the design of consumer charging cables for electronic devices such as phones, laptops, and other portable devices. These cables typically contain multiple conductors, with USB cables, for example, requiring nine conductors (eight wires and a drain wire).
Building Wire, Motor Windings, and Busbars
Copper, specifically electrolytic-tough pitch (ETP) copper, is used as a conductor in building wire, motor windings, and busbars. In cases where high-conductivity copper needs to be welded, brazed, or used in a reducing atmosphere, oxygen-free high-conductivity copper may be employed.
Electrical Appliances
Conductors are found in various electrical appliances, such as irons, toads toasters, and kettles. These appliances rely on conductors to transmit electricity and generate heat or perform other functions.
Magnets and Coils
Small-diameter wires, often insulated with enamel, are used as conductors in the creation of magnets and coils, which produce magnetic fields from the flow of electrons.
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Frequently asked questions
A conductor is a substance, body, or device that readily conducts electricity. In electrical engineering, a conductor is a material that allows the flow of electric charge (electric current).
Metals are common electrical conductors, with copper being the most widely used due to its excellent conductivity. Other metals used as conductors include aluminium, silver, gold, steel, and brass. Non-metallic conductors include graphite, the human body, and the earth.
The flow of negatively charged electrons generates an electric current. In a conductor, the charged particle only needs to nudge its neighbour, who will then nudge its neighbour, and so on, until a particle is nudged into the consumer, thus powering it. This is known as a long chain of momentum transfer between mobile charge carriers.
