Year 12 Physics EEI: Analyzing Wire Resistance and Current Flow

This physics report investigates the relationship between the length of a conducting wire and its resistance, and consequently, the flow of current. The experiment aims to determine how different variables, including the wire's material (nichrome, copper, and constantan) and length, affect resistance. The report outlines the hypothesis that increasing wire length reduces current flow due to increased resistance, supported by the observation of more ion collisions. The procedure involves setting up circuits, measuring voltage and current, and analyzing the results using Ohm's law. Experimental precautions are detailed, and results are presented in tables and graphs, demonstrating a trend of increasing resistance with increasing wire length. The analysis discusses equipment issues like unstable voltage and thermal heat, which affected the results, particularly for the copper wire. The report concludes that the hypothesis is supported, with the length of the wire directly influencing its resistivity and the overall current flow, as confirmed by the graphical representations and Ohm's law calculations. The report also suggests improvements for future experiments, such as controlling the temperature and ensuring straight wire measurements.