Umair Gaines
The best conductor of electricity is silver, due to its high number of movable atoms (free electrons). However, silver is not commonly used as a conductor because it is expensive and tarnishes easily. Copper is the most widely used electrical conductor due to its high conductivity, malleability, and low cost. Other good electrical conductors include gold, aluminium, zinc, nickel, iron, and platinum.
| Characteristics | Values |
|---|---|
| Greatest conductor of electricity | Silver |
| Second-best conductor of electricity | Copper |
| Third-best conductor of electricity | Gold |
| Metals with one valence electron | Copper, gold, platinum, silver |
| Metals with two valence electrons | Iron |
| Metals with three valence electrons | Aluminium |
| Semi-conductor metals | Four valence electrons |
| Good conductors with other characteristics | Aluminium, brass, iron, nickel, platinum, zinc |
| Good conductors with drawbacks | Lead, stainless steel |
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What You'll Learn
Silver is the best electrical conductor
Silver is also used to plate copper to protect against oxidation in electrical contacts. Silver oxide is more conductive than copper oxide and forms more slowly, especially at high temperatures. However, silver oxidises quickly, and silver oxide is a p-type semiconductor. Silver also tarnishes easily, which, along with its high cost, limits its use as a conductor.
Other good electrical conductors include copper, gold, aluminium, zinc, nickel, iron, and platinum. Copper is the most common electrical conductor due to its high conductivity, malleability, and low cost. Gold is highly conductive and resists corrosion and tarnishing, but its high price means it is used sparingly. Aluminium is a good conductor but forms an electrically resistant oxide surface in electrical connections, which can cause overheating. Zinc is a moderately good conductor, becoming malleable at 100°C. Nickel is also highly conductive. Iron is a good conductor due to its metallic bonds, where electrons are free to move around more than one atom. Platinum is highly conductive and more ductile than gold, silver, or copper, but it is less malleable than gold.
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Copper is the second-best conductor
Silver is the best conductor of electricity due to its high number of movable atoms, or free electrons. However, silver is more expensive than other materials and is therefore not commonly used. Copper is the second-best conductor of electricity. It is a highly conductive metal due to its single valence electron, which moves throughout the metal with little resistance. Copper is also cheaper than silver and is commonly used as an effective conductor in household appliances and electrical equipment in general. It is pliable and easy to wrap or solder, making it the best choice when large amounts of wiring are needed. Copper is used in motors, generators, transformers, and bush bars. It is also used in microelectronic conductors, electric circuits, and microprocessors because of its high conductivity and low resistance to joule heating.
Although silver is the better conductor, it oxidises quickly, forming silver oxide, which is a semiconductor. This is not the case with copper, which is why copper is often used to protect silver against oxidation in electrical contacts. Silver oxide is more conductive than copper oxide, but it forms faster, especially at high temperatures.
Other good electrical conductors include gold, aluminium, zinc, nickel, iron, and platinum. Brass, an alloy of copper, is also used to conduct electricity. It is made by adding approximately 30% zinc to pure copper and is ideal for electrical and electronic terminals and connectors.
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Gold is highly conductive
Gold is also used in many day-to-day devices as it does not corrode easily and has a higher corrosion resistance compared to silver and copper. Gold can be applied very thinly, so any increase in resistance would be negligible. Plating a metal with gold will preserve the metal by preventing oxidation indefinitely as long as the gold seal remains complete. For example, gold-tipped headphone jacks do not rust because pure gold doesn't oxidise.
The presence of valence electrons determines a metal's conductivity. The valence electrons are "free electrons" that allow metals to conduct electric current. Metals with one valence electron include copper, gold, platinum, and silver. Iron has two valence electrons. Gold is highly conductive due to its high number of valence electrons.
Temperature, impurities, and electromagnetic fields can all change how well a material conducts electricity. Gold is more stable at high temperatures compared to silver and copper.
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Iron is a good conductor
Silver is widely recognised as the best conductor of electricity. This is because it contains a higher number of movable atoms (free electrons) than other elements. However, silver is expensive and is reserved for use in specialised equipment such as satellites or circuit boards. Copper is the next best conductor and is commonly used in household appliances.
Metallic bonding causes metals to conduct electricity. In a metallic bond, atoms of the metal are surrounded by a constantly moving "sea of electrons". This enables the metal to conduct electricity and move freely among the ions. Most metals conduct electricity to a certain extent.
Iron's electrical conductivity is comparable to that of other metals such as zinc, nickel, and aluminium. However, it is important to note that while iron is a good conductor, it is not as conductive as silver or copper.
The conductivity of a material can be affected by factors such as temperature, impurities, and electromagnetic fields. For example, increasing the temperature of a conductor generally decreases its conductivity while increasing its resistivity. Similarly, adding impurities to a conductor, such as silver, can decrease its conductivity by hindering the flow of electrons.
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Platinum is more conductive than gold
Silver is the best conductor of electricity due to its high number of movable atoms, or free electrons, which allow electricity to move through the metal with little resistance. Silver is followed by copper and gold as the most electrically conductive metals. However, silver is more expensive than other materials and is not usually used unless required for specialised equipment. Copper is cheaper and commonly used in household appliances, while gold is too expensive for common use but offers superior corrosion resistance.
Platinum is an element with high electrical conductivity and is more ductile than gold, silver, or copper. It is also less malleable than gold. Platinum has excellent resistance to corrosion and is stable at high temperatures, making it a good choice for specific applications. Although gold is a good electrical conductor and does not tarnish when exposed to air, platinum's higher ductility and comparable conductivity make it a more favourable option in certain cases.
The presence of valence electrons determines a metal's conductivity. Metals with one valence electron include copper, gold, platinum, and silver. Iron has two valence electrons, while aluminium has three. A semiconductor is a material with four valence electrons. The number of valence electrons in an atom allows it to conduct electricity through metallic bonding, where the metal atoms are surrounded by a "sea" of constantly moving electrons. This enables the free movement of electrons and ions, facilitating electrical conduction.
Factors such as temperature, impurities, and electromagnetic fields can influence a metal's conductivity. Increasing the temperature generally decreases conductivity and increases resistivity. Impurities hinder electron flow, and electromagnetic fields can generate magnetoresistance, slowing the current. Additionally, the size and shape of a substance also affect its conductivity.
While silver is the best electrical conductor, other factors like cost, availability, and specific requirements must be considered when choosing a metal for electrical applications. Platinum's high conductivity, ductility, corrosion resistance, and stability at high temperatures make it a valuable alternative to gold in certain situations.
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Frequently asked questions
Silver is the best conductor of electricity because its electrons are freer to move than those of other elements.
Silver has a higher number of movable atoms (free electrons). For a material to be a good conductor, the electricity passed through it must be able to move the electrons.
Copper is the second-best electrical conductor and is commonly used in electrical applications because it is cheaper than silver. Gold is another good electrical conductor that resists corrosion. Other good electrical conductors include aluminium, zinc, nickel, iron, and platinum.
Several factors can impact a material's conductivity, including temperature, impurities, electromagnetic fields, shape, and size.
