Physics coursework - Resistance of a wire

GCSE Physics Coursework - Resistance of a Wire Aim: To enquire how the resistance of a outfit is affected by the standoffishness of the wire. What is resistance? Electricity is conducted finished a conductor, in this lineament wire, by means of liberal electrons. The number of publish electrons depends on the material and much innocent(p) electrons means a perk up better conductor, i.e. it has less resistance. For example, gold has more free electrons than contract and, as a government issue, it is a better conductor. The free electrons argon given zip fastener and as a result move and collide with neighbouring free electrons. This happens across the length of the wire and thus electricity is conducted. Resistance is the result of energy wrong as heat. It involves collisions between the free electrons and the fixed particles of the metal, different free electrons and impurities. These collisions convert some of the energy that the free electrons are carrying into h eat. How is it deliberate? The resistance of a length of wire is mensurable by measuring the on-line(prenominal) present in the go (in series) and the voltage across the wire (in parallel).

These measurements are then utilize to this approach pattern: V = I ´ R where V = Voltage, I = afoot(predicate) and R = Resistance This can be rearranged to: R = V I Ohms Law It is also relevant to hit the sack of Ohms Law, which states that the current through a metal(prenominal) conductor (e.g. wire) at a continuous temperature is proportional to the potential difference (voltage). hence V ¸ I is unvaried. This means that the resistance of a metallic conductor i s constant providing that the temperature al! so remains constant. Furthermore, the resistance of a metal increases as its temperature increases. This is because at higher temperatures, the particles of the conductor are... If you deficiency to get a full essay, order it on our website: OrderEssay.net

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