10 Examples of Electrical Conductors and Insulators

10 Examples of Electrical Conductors and Insulators Do you need examples of electrical conductors and insulators? Heres a handy list, but first, lets review just what conductors and insulators are. How Electrical Conductors and Insulators Work Electrical conductors are materials that conduct electricity; insulators dont. Why? Whether a substance conducts electricity depends on how easily electrons can move through it. Protons dont move because, while they would carry electrical charge, they are bound to other protons and neutrons in atomic nuclei. Valence electrons are like outer planets orbiting a star. They are attracted enough to stay in position, but it doesnt always take a lot of energy to knock them out of place. Metals readily lose and gain electrons, so they rule the list of conductors. Organic molecules are mostly insulators, in part because they are held together by covalent (shared electron) bonds and also because hydrogen bonding helps stabilize many molecules. Most materials are neither good conductors, nor good insulators. They dont readily conduct, but if enough energy is supplied, the electrons will move. Some materials are insulators in pure form, but will conduct if they are doped with small quantities of another element or if they contain impurities. For example, most ceramics are excellent insulators, but if you dope them, you can get a superconductor. Pure water is an insulator, but dirty water conducts weakly and salt water, with its free-floating ions, conducts well. 10 Electrical Conductors The best electrical conductor, under conditions of ordinary temperature and pressure, is the metallic element silver. Its not always an ideal choice as a material, though, because of its cost and because it tarnishes. The oxide layer known as tarnish is not conductive. Similarly, rust, verdigris, and other oxide layers reduce conductivity. silvergoldcopperaluminummercurysteelironsea waterconcretemercury more conductors: platinumbrassbronzegraphitedirty waterlemon juice 10 Electrical Insulators rubberglasspure wateroilairdiamonddry wooddry cottonplasticasphalt more insulators: fiberglassdry paperporceleinceramicquartz Its worth noting the shape and size of a material affects conductivity. A thick piece of matter will conduct better than a thin piece of the same length. If you take two pieces of a material that are the same thickness, but one is shorter than the other, the shorter one will conduct better. It has less resistance, in much the same way its easier to force water through a short pipe than a long one. Temperature also affects conductivity. As increase temperature, atoms and their electrons gain energy. Some insulators (e.g., glass) are poor conductors when cool, yet good conductors when hot. Most metals are better conductors when cool and poorer conductors when hot. Some good conductors become superconductors at extremely low temperatures. Although electrons flow through a conductive material, they dont damage the atoms or cause wear, like you would get from friction of water in a canyon, for example. Moving electrons do experience resistance or cause friction, however. The flow of electrical current can lead to heating of a conductive material. Do you need more examples? Here is a more comprehensive list that includes thermal conductors and insulators.

Le Belle Dame Sans Merci written on 1820 by John Keats Essays

Le Belle Dame Sans Merci written on 1820 by John Keats Essays Le Belle Dame Sans Merci written on 1820 by John Keats Paper Le Belle Dame Sans Merci written on 1820 by John Keats Paper I will be comparing the poems Lochinvar written by Walter Scott in 1808 and Le Belle Dame Sans Merci written on 1820 by John Keats. Lochinvar and Le Belle Dame Sans Merci are two Romantic poems that claimed popularity in the movement of Romanticism simply because they were short in length, they both tell a story and contain a plot, they were fashionable for the Romantic movement also they were easy to remember and recite. The main and most obvious similarity between the two poems is that they are Romantic. The Romantic period began about 1798 and ended approximately around 1832. Romantic poetry concentrated on nature, feelings and emotions. Furthermore the subject matters of the supernatural and medieval were used. It was a break with the old tradition, that was until the Victorian movement moved in and people, actions, outward morality and reason were more important. Poems such as Porphyrias Lover were written during the Victorian movement. One of the main differences between the two poems would be that Le Belle Dame Sans Merci is a ballad whereas Lochinvar uses rhyming couplets and archaic language. In addition Le Belle Dame Sans Merci could be described as being tragic and heart-rending where Lochinvar is the perfect fairytale with the idyllic ending. Le Belle Dame Sans Merci can be considered a ballad because of its tragic content, the inclusion of a knight and the effective use of natural imagery. It is broken into four line stanzas as ballads usually are and a regular rhythm. Additionally each of the four line stanzas describes a separate incident in the poem, breaking it up into small, short scenes. Le Belle Dame Sans Merci rebels against being a ballad in a few ways. One of the most important being that it does not follow the expected rhyme scheme of A B A B; instead it goes A B C B. Lochinvar is also written in the style of a ballad to some extent. It is more of a folk style of writing. Some examples of this would be when, The bride kisses the goblet, and, He stayed not for bracken, and he stopped not for stone. There is also some archaic language used, such as, ere, ye, saith, twere better by far, and quoth. Archaic language is generally used to crate a Scottish accent and emphasise medieval subject matter. The Scottish element supports the idea of the folk style of writing. The rhyme scheme used in this poem is rhyming couplets adding a steady rhythm to the poem. There is also a small amount of natural imagery used. The story of Lochinvar tells a tale of a knight who goes and rescues the woman that he loves from her wedding. Lochinvar wants to get married to Ellen. Ellen has just been married but Lochinvar turns up at the wedding reception. It is clear that Lochinvar and Ellen are in love. They dance with each other at the wedding reception but Ellens mother and father are not at all pleased with this. It is at this point that they run away together. Their families attempt to follow them. The main characters in Lochinvar would be Ellen and Lochinvar. Lochinvar is a Scottish Lord and Knight. He is very brave and bold. We know this because, He rode all unarmed and, he rode all alone, also He stopped not for break, and he stopped not for stone, and He swan the Esk River where ford there was none. There is some speculation that he could be dangerous. We know that Ellens family is quite well off, the live at Netherby Hall. And Ellens parents do not approve of Lochinvar. It could be possible that Ellens marriage could be arranged. Lochinvar and Ellen have been in love for some time so maybe Ellens parents arranged this marriage to try and exclude Lochinvar from Ellens life. The story of Le Belle Dame Sans Merci is that of a tragic one, ending in possible death and mystery. The narrator in the poem meets a knight who looks extremely unwell. The narrator asks the knight what is wrong. He continues to tell the narrator that he met a fairy in the field. He made her some jewellery consisting of flowers, then the fairy tells him that she loves him. The fairy then took the knight to a cave. She cries and he kisses her. The fairy then sings the night to sleep, then he has bad dreams about death. He then wakes and appears to be in a field. A strong possibility is that the whole encounter could have been a dream. English Literature Kieran Walsh 10E Show preview only The above preview is unformatted text This student written piece of work is one of many that can be found in our GCSE John Keats section.