Electricity flows eesistance metals. The metal is full of "free" electrons that do not stick to any particular atom; rather, they fill the space between the atoms.
Investigating the Factors that Affect the Resistance of a Wire
When these electrons move, they create an electric current. Conductors have resistance, but some are worse than others. The free electrons keep bumping into atoms. A wire's resistance depends on four main factors:.
I will investigate how the length of the wire affects the resistance. I have done a preliminary experiment to help me decide the best way to do my investigation. The results will help me make predictions, as well.
What Affects the Strength of an Electromagnet?
Below are my results from the preliminary experiment see Table 1. To ensure accuracy, I have taken three readings each of volts and current.
These results show that as the length of the wire increases, the resistance increases, as well. Furthermore, if you double the length of the wire, the resistance is roughly doubled.
Found what you're looking for?
For example, wirf the length of the wire is 20cm the resistance is 3. In my main investigation I will see if this observation applies to my results.
I found that the apparatus I used was suitable, but I think that I could possibly increase the number of data points to generate more reliable results, perhaps by increasing the length of the wire by 5cm each time, instead of by 10cm. I predict that the longer the wire, the larger the resistance.
This is because the free electrons in the wire bump into more resistance of a wire coursework variables, thereby making it harder for electricity to flow.]