GCSE Physics Coursework - ohmic granting immunity of a Wire Coursework resistivity of a Wire Task To look into how the confrontation of a wire is affected by the aloofness of the wire. Theory What is resistance? Electricity is conducted through a conductor, in this case wire, by pith of drop by the wayside electrons. The number of impoverished 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 straighten out and, as a result, it is a better conductor. The free electrons argon given zipper and as a result front and collide with neighbouring free electrons. This happens across the distance of the wire and therefore 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 exchange some of the energy that the free electrons are carrying into heat. How is it measured? The resistance of a length of wire is calculated by quantity 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 differe nce (voltage). Therefore V ¢¬ I is constan! t. This means that the resistance 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:
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