Conductors and Insulators

 

Noah Nishihara Homegroup 909Tuesday, 13 October 2015

Conductors and Insulators

Conductors have little resistance, and electricity passes through it easily. The metal that has the least electric resistance is silver, followed by copper and gold. On the periodic table, the elements on the left side are better conductors than those on the right as they have fewer electrons in their valence shell.

Insulators have high electrical resistance and are poor conductors of electricity. Commonly used insulators include (thermosetting) most types of plastics, rubber, wood, glass and porcelain (including clay and quartz). Insulators hold onto their existing electrons or attract electrons thereby limiting the flow of electrons.

Conductivity of a material can change when factors change. The atomic qualities of the material, the length and amount of material as well as the temperature of the material will all affect conductivity.

Conductors

Insulators

Silver

Soda-lime glass

Copper

Feldspathic porcelain

Gold

Muscovite

Aluminium

Natural rubber

Magnesium

Epoxy resin PEO

Tungsten

Polyethylene PE

Nickel

PVC (made from vinyl choride)

Iron

Polycarbonate PC

Platinum

Bakelite PF

Tin

Urea resin UF

Mercury

Melamine resin MF

Nichrome (an alloy made up of Nickel and Chrome)

Polyimide resin

Graphite

Ebonite

Polyacetylene

ABS resin

Polyphenylenevinylen? (used in EL panels)

air

a coin

A piece of paper

 

1.      An electric current is a flow of electric charge involving the movement of electrons.

2.      aA conductor allows electrons to flow freely whereas an insulator limits it from doing so. bElectrical conductors include copper and aluminium. Insulators include rubber-like polymers and most plastics.

3.      aA path for electricity is called a circuit.

b A switch lets you open and close a circuit.

c The movement of electrons in a wire is calledan electric current.

d Substances which do not allow an electriccurrent to flow through them are called non-conductors.

e Metals are good conductors because they allow anelectric current to flow through them.

f The more current there is flowing around acircuit, the brighter a bulb glows.

g If the resistance in a circuit increases, thecurrent slows.

h A conductor has little resistance, while aninsulator has high resistance.

Comments

Post a Comment

Popular posts from this blog

Australian Icons Research

  Australian Icons Research- Why and How is Qantas Airlines Iconic? In March 1919, W Hudson Fysh and Paul McGinness became interested in a competition sponsored by the Government. They were unable to receive funding, and so, on 18 August 1919, in a Model T Ford, they began an assignment from the Defence Department to check a different competition route. It was during these 51 days when their determination grew to allow outback Queenslanders and people of North Australia have access to a more reasonable way of life. The key to this was air transport. Fergus McMaster, a wealthy grazier who was friends with McGinness, was the primary supporter of this new idea. He was Chairman in the beginning. The formation of the original Qantas company (Queensland and Northern Territory Aerial Services Limited.) was in 16 November 1920. The well-known ‘QANTAS’ was created from the acronym of this first name. Joy riding and demonstration flights were undertaken with two expertly modified old plane...
Read more

reverse-engineering

  Whether it's rebuilding a car engine or diagramming a sentence, people can learn about many things simply by taking them apart and putting them back together again. That, in a nutshell, is the concept behind reverse-engineering—breaking something down in order to understand it, build a copy or improve it.   A process that was originally applied only to hardware, reverse-engineering is now applied to software, databases and even human DNA. Reverse-engineering is especially important with computer hardware and software. Programs are written in a language, say C++ or Java, that's understandable by other programmers. But to run on a computer, they have to be translated by another program, called a compiler, into the ones and zeros of machine language. Compiled code is incomprehensible to most programmers, but there are ways to convert machine code back to a more human-friendly format, including a software tool called a decompiler.   Reverse-engineering is used for m...
Read more

ADDENDUM FOR BIOLOGY NATURAL SELECTION

Geographical isolation is characterised in this experiment by the difference of the swamp and forest and the existence of a desert in between the two ecosystems. Natural features are the main cause of isolation. These include rivers and mountain ranges. The geographical isolation of landmasses by continental drift is another good example. In general, reproductive isolation is the inability of related or different species breeding due to differences involving many factors. These include geographical, behavioural, physiological, or genetic barriers or differences (isolating mechanisms). Speciation could occur in this simulation in various ways. There are many types or modes of speciation. Since the yellow frogs in the swamp have very little variation, they will be much less likely to survive when the environment changes. If we suppose the forest became a bush, the frogs would have a higher chance of survival. In our simulation there was no movement between the two ecosystems. If the sw...
Read more