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I am going to investigate what factors affect the resistance of a wire There are three main factors which affect the resistance of a wire The material of the wire What the wire is made out of The length of the wire The thickness of the wire The diameter of the wire Resistance is a force which opposes the flow of an electric current around a circuit so that energy is required to push the charged particles around the circuit The circuit itself can resist the flow of particles if the wires are either very thin or very long eg The filament across an electric light bulb Resistance is measured in ohms The symbol for an ohm is A resistor has the resistance of one ohm if a voltage of one volt is required to push a current of one amp through it George Ohm discovered that the emf of a circuit is directly proportional to the current flowing through the circuit This means that if you triple one you triple the other He also discovered that a circuit sometimes resisted the flow of electricity He called this resistance He then came up with a rule for working out the resistance of a circuit VI R V - volts I - current R - resistance To begin with I am going to investigate which materials put up the highest resistance and I will combine it with the investigation about which length puts up the greatest resistance The type of material will make a difference because the electrons have to pass through the material These electrons find it easier to pass through some materials than others In this experiment I am going to use copper and nichrome wire I predict that the nichrome wire will have a higher resistance than the copper wire I can say this because I know that the electrons have to squeeze together
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