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GCSE Physics Coursework - Current in a Wire

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GCSE Physics Coursework - Current in a Wire Coursework Variables to be measured: * Length of Wire * will be varied * Material of wire (experiment will be repeated for wires of different materials to see if the same effects are present when the length is varied) * Current through piece of wire. * Voltage across piece of wire. Variables to be kept constant: * Starting Temperature of the wire * Width of Wire (Cross-sectional area of wire) - for each experiment, the width of wire will not be varied. * Voltage supply from power pack (6 volts). Theory Current is directly proportional to voltage. ...read more.


Proposed Method As previously discussed, the length of wire was the easiest to control and measure, so this is what I shall vary. The following circuit was made to carry out the investigation: 1. One metre length of a wire is fixed to a metre rule. 2. The first crocodile clip is clipped to the wire at the 0cm position on the metre rule. 3. The second crocodile clip is clipped to the specific position depending on the required length of wire. 4. The power supply is turned on, with a constant voltage of 6 volts. 5. After waiting for 20 seconds for the temperature to become constant, the voltage and current are then read off the ammeter and voltmeter, and recorded. ...read more.


This is because the longer the wire, the more times the free electrons will collide with other free electrons, the particles making up the metal, and any impurities in the metal. Therefore, more energy is going to be lost as heat in these collisions, thus raising the temperature and by Ohm's Law the resistance will increase, thus the opposition to current increases and the current decreases. * Doubling the length of the wire will result in double the resistance, meaning half the current. This is because by doubling the length of the wire one is also doubling the collisions that will occur, thus doubling the amount of energy lost in these collisions. Proportionality: Current is inversely proportional to the Length of Wire. Resistance is directly proportional to the Length of Wire ?? ?? ?? ?? ...read more.

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