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An Investigation into the factors that affect the electrical resistance of a wire
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- Words:
- 4006
- Submitted:
- Thu Jul 11 2002
... Physics Practical Assessment Rachel Jones Candidate Number: Farmors School Centre Number: An Investigation into the factors that affect the electrical resistance of a wire Aim: To explore and explain why specific changes to a wire can increase or decrease the resistance of that wire. Background: What is resistance? An electrical conductor is a substance through which electrical current flows with little resistance. Electricity is passed through a conductor, in this case a length of wire, by means of free electrons. In metals the atoms are arranged in a regular crystal lattice, and so the electrons in the outer shells of the atoms are free to move through the metal, even if it is a solid. It is this 'sea' of mobile electrons that allow the conduction of electricity. The number of free electrons depends on the material due to the varying amounts of electrons in the outer shell. The more free electrons the better
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