Substances which are good conductors have free electrons. These charged particles can flow transferring charge from one place to another thus conducting electricity. All solid metals have free electrons so conduct electricity but non-metals such as solid iodine don't have free electrons so do not conduct electricity.
The rails are good conductors The wooden ties they rest on are insulators
heat conductors: Copper aluminium Iron Graphite Brass Steel Insulators: Newspaper Plastic Cast-Iron Cotton Wool
Inside an outlet there are conductors: hot, neutral, and sometimes ground. The rest of the inside of an outlet is insulator, to keep these conductors from shorting.
an apple a day keeps the doctor away
It is good to have a rest if you are to be in good and sound health.
The train conductors (the guys who ride in the box at the front of every car) do it, except on cars that don't have conductors. Some subway lines have pre-recorded messages. The rest just don't have any announcements.
You give him the rest of the materials.
Deers don't make homes. They'll basically roam their territory, and when they want to rest, they'll just find a nice protected spot and lie down for a while.
AnswerA Trick Question. While at rest, an object has no inertia.
I believe it is the waste that the snail excretes from the body due to unused materials that the snail took in.
Fuses are designed to carry safe amounts of electrical current and to rapidly break the circuit when current becomes too intense. Metals, because their valence electrons are not constrained, are good electrical conductors. As current is increased, resistance to electron flow causes the metal to heat and then to melt, breaking the electric circuit, and preventing damage to anything other than the fuse. Carbon is also a good conductor. But as current increases and it becomes hot its resistance decreases. So it does not offer protection to the rest of the circuit. Other materials, glass, ceramics, polymers, and semiconductors do not have free electrons and either insulators or poor conductors so they don't work as well in high current circuits.
ANSWERDirect current (DC) is the function of having a constantdifference in potential at opposite ends of an electrical circuit. An electrical circuit is any configuration that allows electrical current to flow across any point within the circuit.There is a phenomenon known as Galvanic Action. This occurs when a pair of conductors made from different materials makes contact. At the point of contact, the junction, there is a minuscule difference in potential between the two different materials. These potential differences are measured in micro-volts. These potential differences exist because every material, at rest, has a particular energy level unique to that material. Since there is a difference in energy level between any two materials, there exists an electrical potential difference between them as well.Only in conductors can electrical current flow freely. Electrical current flow is electron flow between atoms in a conductive material. Any material will conduct electricity given a high enough potential difference across the material. Gold, Silver, and Copper, are three examples of high conductivity materials, or good conductors. It takes a minuscule difference in potential to get electron flow within these materials. Plastic, glass, and porcelain are three examples of no conductivity materials, or good insulators. It takes an excessive difference in potential to break these materials down in order to get electron flow within these materials.Plastic is a relatively good insulator because it takes a considerable amount of potential difference (voltage) across the material to get electron flow within the material. This makes plastic a good insulator and this is why it is found in many electrical circuits. Porcelain is an insulator used in high voltage circuits. These are the long suspension devices used to hang high tension power cables you see on towers that deliver power between cities.I hope this makes some sense. This explanation could go on for a very long time.