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Resistance Of A Wire (Gcse Corsework)

2812 words - 11 pages

Does Increasing the Length of a Nichrome Wire Affect its Resistance?IntroductionIn this experiment I am going to see weather the thickness of wire will affect the resistance of a wire. I will also be seeing weather different lengths of wire effect the resistance of the wire. I will be setting up the wire to a circuit and will be using a ammeter and volt metre to record my results.Background informationElectric current is a flow of electrons along a conductor like a metal wire. The electric cell pushes the electrons round the circuit. Break the circuit and the electrons cannot flow. Electric current is not used up because electrons are not destroyed. Light bulbs produce light because they have high resistance and resist the flow of the electrons. The current is measured in amps using an ammeter.Potential difference provides push to drive the current round the circuit; potential difference is measured in volts. In a series circuit the potential difference supplied by the battery is divided up between components in the circuit.Resistance is a measure of how hard it is to get a current to flow through a component at a particular potential difference or voltage. Each component in a circuit has a resistance.PredictionI think that if I increase the length of the wire, then the resistance will increase. I also think as the thickness of the wire is increased the resistance will decrease, I think this because An electric current flows when charged particles called electrons move through a conductor. The moving electrons can collide with the atoms of the conductor. This makes it more difficult for the current to flow, and causes resistance. Electrons collide with atoms more often in a long wire than they do in a short wire. A thin wire has fewer electrons to carry the current than a thick wire. This means that the resistance in a wire increases as:- The length of the wire increases.- The thickness of the wire decreasesElectric current is a flow of electrons along a conductor like a metal wire. In my experiment I expect the current to decrease as resistance increases. I expect this as when the thickness of the wire is increased the easier it will be to push the current around the circuit therefore using less voltage to do so.Voltage is the measurement of potential difference and potential difference provides push to drive the current round the circuit. In the experiment I expect the voltage toResistance is a measure of how hard it is to get a current to flow through a component at a particular potential difference or voltage. Each component in a circuit has a resistance. In my experiment I expect the resistance to decrease as the length of the wire increases. I expect this asResistance is measured in ohms (the greater the ohms the grater the resistance. Ohms are calculated using ohms law. Ohms law is the link between:Potential difference (volt, V) Current (ampere, A) Resistance (ohm, W)The equation below shows the relationship between potential difference...

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