Voltmeter: Measures voltage in volts, it must be placed in parallel around the component under test – not around the variable resister or battery and proper name for voltage is potential difference.
100cm piece of wire
Meter ruler:
Prediction
In a length of wire there are many ions, the length of wire is crammed with the ions. When a current gets to the wire it has to pass the ions to get through, so the longer the piece of wire the longer it will take to dodge round all the ions and get through the piece of wire. There for the longer the piece of wire the more resistance.
How I will make it a safe test?
I shall make it safe by having scientific supervision; I will also have protective equipment to prevent any damage to any one. I will also do this experiment in a group; we will also do the experiment slowly.
How will I make it a fair test?
To make it a fair test I shall do the experiment for each length a number of times, I shall measure in the exact same position each time as well. I shall use the same equipment and which ever measurement for each length is most popular I shall choose as the over all measurement.
Factors that will effect my investigation
Resistance
Resistance is anything in the circuit that slows it down for example; the wire is the resistance in this experiment.
Current
Current is the flow of electrons around a circuit. Current will only flow through a component if there is a voltage across that component.
Voltage
Voltage is the driving force that pushes the current around. Voltage is kind of like electrical pressure.
The formula for the above 3 is V = I
R
Method
We set out the apparatus as shown above in my diagram. Firstly we taped the 100 cm wire to a meter stick; after this we switched on the power pack and placed one clip at 0 and another at 10, and referred to the ammeter for the results (we recorded the results five times per length), which were then recorded. The same process was carried out over again increasing in amounts of 10cm a time all the way up to 100 cm. We then observed our results and calculated the model average per set of results for the overall result.
Evaluation
In my conclusion I have discovered that if you increase the length of the wire the current will take longer to get by the ions, this is because in a length of wire there are many ions, the current tries to find the quickest root through these ions so when the wire is a longer length the more time it takes the current to get through which will apply more resistance to the current, there for the longer the length of the wire the more resistance is applied to the current.
