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Resistance of a Wire. GCSE ... wire. Resistance is the force that slows down the
flow of electrons; this can be due to electrons colliding. ...
cause of resistance. Aim The resistance of a conductor is well known to be dependent
upon the Material it is made from, its length, diameter, and temperature. ...
Resistance coursework - some useful things. ... The longer piece of wire the more energy
needed. When the length is doubled so does the resistance. ...
Resistance of a Wire. Task To investigate how the resistance of a wire is affected
by the length of the wire. Theory What is resistance? ...
current and resistance of a wire and the affects when the length changes. ... Density
Density has a large affect on the amount of resistance. ...
Submitted by ahmed_316 on June 5, 2005
Category: Science
Words: 6817 | Pages: 28
Views: 483
Popularity Rank: 19,206
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Introduction
The purpose of this investigation is to expose the factors responsible for affecting the resistance of a wire in an electrical circuit. Many factors will have to be investigated prior to experimentation. A prior knowledge of electrical circuits and the factors of resistance will be required. The conclusive objective will be that research on the subject matter is proven by experimentation.
Resistance
The standard opinion of resistance when electricity is concerned is the ability of a substance to resist the flow of electricity through it. Good conductors are associated with low resistance and poor conductors are associated with high resistance. As resistance is responsible for the current that flows, a high resistance will be responsible for a low current and a low resistance will be responsible for a higher current.
This is definition of resistance given by Hutchinson’s Encyclopaedia:
“In physics, that property of a conductor that restricts the flow of electricity through it, associated with the conversion of electrical energy to heat; also the magnitude of this property. Resistance depends on many factors, such as the nature of the material, its temperature, dimensions, and thermal properties; degree of impurity; the nature and state of illumination of the surface; and the frequency and magnitude of the current. The SI unit of resistance is the ohm (Ω). Resistors are devices, as a coil or length of wire, used in a circuit primarily to provide resistance.”
Resistor
In physics, any component in an electrical circuit used to introduce resistance to a current. Resistors are often made from wire-wound coils or pieces of carbon. Rheostats and potentiometers are variable resistors.
Prior knowledge and Internet research indicates that a Georg Simon Ohm was one of the forefathers of research into electrical...
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