The number of free electrons depends on the material and more free electrons means a better conductor, i.
Theory What is resistance. This happens across the length of a wire and the electricity is conducted I know this because my graph does not show any individual anomalous results.Variables: There are a few variables, which can affect the resistance in a wire. In my hypothesis, I predicted that the effect of changing the wire length will be that as the length increases, the resistance on the wire will increase. Through past experiments I know how to work out resistance, to work it out I use this formula Where the resistance is R, the p. This increase in collisions means that there will be an increase in resistance. Also when the wire is longer the further the electrons have to travel, so as they travel they lose some energy which makes them slower and the resistance is therefore higher Variables The input variable will be the thickness of the wire to the nearest millimetre. The two pieces of wire are Nickel Chrome and Constantin. Material: The type of material will affect the amount of free electrons, which are able to flow through the wire. The free electrons are given energy and as a result move and collide with neighbouring free electrons The amount of current flowing through the wire. Electricity is conducted through a conductor, in this case wire, by means of free electrons. First I will need to identify the factors that effect resistance. The copper wire of cm connected firmly to the piece of wood wood is used as it will not interfere and not conduct So, this effectively means that if the wire was trebled or quadrupled then the resistance would also treble or quadruple.
Therefore it is important to keep the material the same throughout the experiment unless a different material is used to check if the conclusion or theory works for all materials.
In this experiment the intended factor to be investigated was length. Numerous household appliances, such as electric heaters, hair dryers, toasters, oven and electric fires, use a high resistance wire in their elements so that heat is given out.
I will use the same wire for all my measurements.
If a high voltage is used the energy would be in form of heat which would make the experiment unfair. The current has to go through a circuit, which contains resistance so if you increase Hows does changing the length of wire affect resistance?