GCSE Physics Coursework - Resistance of a Wire Coursework Resistance of a Wire

GCSE Physics Coursework - ohmic granting immunity of a Wire Coursework immunity of a Wire Task To look into how the justification of a wire is affected by the aloofness of the wire. Theory What is opponent? Electricity is conducted with a conductor, in this case wire, by inwardness of drop by the wayside electrons. The number of free electrons depends on the hooey and more free electrons means a better conductor, i.e. it has slight resistance. For example, gold has more free electrons than iron and, as a result, it is a better conductor. The free electrons argon given zipper and as a result force out and collide with neighbouring free electrons. This happens crossways the distance of the wire and so electricity is conducted. Resistance is the result of button loss as heat. It involves collisions between the free electrons and the fixed particles of the metal, other free electrons and impurities. These collisions convert some of the energy that the f ree electrons are carrying into heat. How is it measured? The resistance of a length of wire is calculated by metre the current certify in the circuit (in series) and the voltage across the wire (in parallel).

These measurements are then applied to this formula: V = I ¢¥ R where V = Voltage, I = Current and R = Resistance This can be rearranged to: R = V I Ohms Law It is withal relevant to know of Ohms Law, which states that the current through a metallic-looking conductor (e.g. wire) at a constant temperature is proportionate to the emf difference (voltage). Therefore V ¢¬ I is constant. This means that the r! esistance of a metallic conductor is constant providing that the temperature as well as trunk constant. Furthermore, the resistance of a metal increases as its temperature increases. This is because at higher(prenominal) temperatures, If you want to get a full essay, order it on our website: OrderCustomPaper.com

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