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# Investigating (one of) the factors that affect resistance.

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• Essay length: 1807 words
• Submitted: 01/12/2003
GCSE Electricity and Magnetism

The first 200 words of this essay...

Investigating (one of) the factors that affect resistance

Resistance is the property of an electrical conductor, to work against the flow of the current and change some of the electrical energy into heat. According to Ohm's law 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 standard abbreviation for electric resistance is R and the symbol for ohms in electric circuits is the Greek letter omega, ?. For certain electrical calculations, it is convenient to employ the reciprocal of resistance, 1/R, which is termed conductance, G. The unit of conductance is the mho (ohm spelled backwards) and the symbol is an inverted omega, W. To find resistance we use the equation

Resistance = Voltage / Current is used.

The resistance of an object is determined by a property of the substance of which it is made of, known as the resistivity and by the length and cross-sectional area of the object. Also other variables such as the temperature can determine the resistance. Usually, a material's resistance increases with the rise in temperature as the voltage going across the wire

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