In this investigation we are trying to look for resistance in a piece of wire, and how the length of a wire can increase or decrease the resistance. The things that affect the resistance in a wire are:
•the length of the wire
•a certain amount of wire
•cross sectional area of the wire (thickness)
What things can affect the resistance in a wire?
The temperature can affect the resistance in a wire, because the more thermal energy a component has the more the atoms within it will vibrate and get in the path of the “free” electrons, so the higher the temperature, more resistance is being produced.
Material can affect the resistance due to the number of “free” electrons that are available to move or change in the atomic arrangement.
Cross-Sectional Area will affect the resistance as a larger cross-sectional area will provide more paths that the electrons can take enabling a low energy path to be taken and reducing the resistance, a small cross-sectional area has few paths so the resistance would be much higher.
And finally the Length could affect the resistance, the longer the component is the more atoms there will be for the electrons to be passed, and as each atom is surrounded by electrons they will repel the “free” electrons that form the current.
Relationship between Current, Voltage and Resistance
All materials are made up of atoms and all atoms contain protons, neutrons and electrons. Protons have a positive electrical charge, Neutrons have no electrical charge while and Electrons have a negative charge. Atoms are bound together by powerful forces of attraction existing between the atoms nucleus and the electrons in it’s outer shell. When these Protons, Neutrons and Electrons are together within an atom, they are happy and stable. However, if they are separated, they exert a potential of attraction called Potential Difference. If a circuit is created or conductor...