Resistance is the force, which opposes the flow of an electric current within a circuit. As a result of this, energy will be required to drive the charged particles around the circuit. Resistance is voltage divided by current. Resistance is measured in "Ohm's-. This is the result of Ohm's law, which is V = I/R. This means that for a certain circuit there will be a greater voltage across the wire if it has more resistance.
All conductors of electricity have a certain amount of resistance, but some conductors are better than others are. The bigger the resistance is, the harder it will be for an electric current to flow through the wire.
Aim.
The aim of this investigation is to investigate what effect is given on the length of a wire, when the length of the wire increases.
Prediction.
In this experiment, I predict that if the length of the wire increases, then the resistance will increase, in proportion to its length. I think this because the longer the wire is, the more atoms will be contained within the wire. Therefore it is more likely that the electrons are going to collide with the atoms, because there are more atoms in the wire to provide a force to prevent the electrons passing. This must mean that if the length of the wire is doubled, then the resistance will double. The amount of atoms inside the wire will also double. This will result in twice the number of collision between the atoms and the electrons. As a result of this would be that the atoms will slow down the flow of electrons and increase the resistance.
Experimental Detail.
We will use a small voltage and current because we have found out if the wire becomes to hot, this can affect the rate of resistance and would make this experiment unreliable. This happens because when the electrons move the have energy which they pass onto the atoms when they come into collision with them. The energy from the collisions makes the atoms vibrate more (the meter gets hotter) making the atoms more likely to stop the electrons from passing (it's resistance goes up).