How the length and thickness of a wire affects its resistance.

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Wires Investigation                By Jeevan Jyothiprakash 9Y1        

Aim:

I am trying to investigate that how the length and thickness of a wire affects its resistance.

Scientific Knowledge

What is electric charge and current?

Back to the everyday objects again: objects are made of molecules, molecules are made of atoms, and atoms are made of electric charges. Therefore when you look at an object, don't imagine that it is made of little tiny atoms. Instead, imagine that it's made of something even smaller: little tiny electric charges. Matter is made of vast quantities of electric charge, but the positive charge exactly cancels the negative.

Atoms might be made of charges, but atoms are unbreakable, right? Wrong. Atoms are easily broken up. It is the NUCLEUS of an atom which is difficult to shatter. It's quite easy to shred atoms by pulling the negative electrons away from the tiny positive nucleus in the center of an atom. When we rubbed the balloon on our hair, we were pulling atoms apart. We should not think of atoms as if they were unbreakable little solid balls. Atoms are more like liquid droplets made of electrical charge. When atoms come together to form everyday objects, the charges which form the outside of the atoms get all mixed together. It's as if the world was made of charged particles, half of them being the negative electrons, and the other half being the positive cores of atoms.

What would happen if we could make the electric charges flow around inside of an object? Then we would have an electric current. Now you know what an electric current really is. It's that simple. An electric current appears whenever the negative charges in an object are forced to flow through the positive charges, or when positive charges are forced to flow through negative ones.

Everyday objects are made of Electric Charge: objects are made of molecules, molecules are made of atoms, and atoms are made of positive and negative charges. Electric charge is a kind of material substance, but it is not atoms, instead it is the stuff that is inside of the atoms. If we could place equal quantities of positive charge and negative charge together, what would be the result? Neutral matter.

What is A.C and D.C?

The type of electricity commonly used is alternating current or AC electricity. As the name implies, the current alternates in direction as opposed to the direct current (DC) electricity that you get from batteries. The AC and DC generators are similar, but AC was proven to be a more effective way to transmit electrical power. AC is the electricity we have in our homes, and it powers our television, lights and computers.

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D.C

DC electricity is a direct flow of electrons through a conductor such as a metal wire. A battery or DC generator usually provides a source of electrons and the potential or voltage between the positive (+) and negative (-) terminals. This flow of electrons through a wire can be thought of as similar to the constant flow of water through a hose.

A.C

Alternating Current or AC electricity is a back-and-forth movement of electrons in a wire, similar to sloshing water back-and-forth in a hose. When the force of a negative (-) charge is at one ...

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