GCSE Physics Coursework - ohmic granting immunity of a Wire Coursework
Resistance of a Wire
Task
To look into how the resistance 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 means of drop by the wayside electrons. The number of indigent 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 move and collide with neighbouring free electrons. This happens across the distance of the wire and thus 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 free electrons are carrying into heat.
How is it measured?
The resistance of a length of wire is calculated by measuring 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 proportional to the emf difference (voltage). Therefore V ¢¬ I is constant. This means that the resistance of a metallic conductor is constant providing that the temperature also trunk constant. Furthermore, the resistance of a metal increases as its temperature increases. This is because at higher(prenominal) temperatures,
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