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An Investigation Into Electrical Resistance - Term Papers

An Investigation Into Electrical Resistance

Resistance, in electricity, is a property of any object or substance to resist the flow of an electrical current. The quantity of resistance in an electric circuit determines the amount of current flowing in the circuit for any given voltage applied to the circuit. The resistance of an object is determined by the nature of the substance of which it is composed, its resistivity, accounting for its dimensions and its temperature. Resistivity is expressed in terms of Ohms / cm3 at 20şC. An electrical conductor is any material that offers little resistance to the flow of an electric current. The difference between a conductor and an insulator, which is a poor conductor of electricity, is ...

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setup would involve a circuit with a set of cells connected in series with an ammeter and the piece of wire being investigated, and a voltmeter connected in parallel with the wire. The ammeter is placed in series with the wire. An ammeter has a low resistance, so that it introduces as little extra resistance as possible into the circuit. The voltmeter is connected in parallel with the wire. Voltmeters have a high resistance, so the current they take is usually negligible.
We decided on the variables that could affect the resistance of a wire:

 Length of the wire

 Thickness of the wire

 The material used as the wire

 Temperature

We were to investigate as many of these factors as possible given a limited period of time. We would carry out a set of experiments where in each one we changed one variable while keeping the others constant. In each case we would have to measure the current passing through the circuit and the potential ...

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PAPER DETAILS

Added: 7/25/2004 11:17:54 AM
Category: Science & Nature
Type: Premium Paper
Words: 1160
Pages: 5

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