Measuring the electrical resistivity of a wire Lab Report

Measuring the electrical resistivity of a wire - Lab Report Example For a piece of the conductor, its resistance is determined using the following relationship; Where, L is the length of the wire where the voltage is measured, and A is the area of the cross-section of the wire. Resistivity is measured in ohm-meters (ÃŽ ©m). The cross sectional area can be determined using the following formula. Conductivity specifies the electrical character of the conductor in terms of its capability in conducting current. Conductivity is measured in units of ohm-meters (ÃŽ ©m-1). Most metals are very good electricity conductors (Bird, 2013). Validity is the process of determining whether or not the obtained data is correct and the degree of its validity (Holm, 2013). The process is done by obtaining the percentage errors in the readings reflecting the data accuracy. Percentage error: In every experiment, error are meant to occur due to measurement accuracies (Mathsisfun.com, 2012). In our experiment, we used the meter ruler where reading were made by eye observation. Direct observation can give different records due to different angles of view. The voltmeter and the ammeter also give wrong readings if they are not correctly calibrated. The next time we perform an experiment on the resistance of the conductor, we would first conduct research on the various factors affecting the resistance of the conductor in use and choose the most effective one. The experiment was performed by regulating the voltage on the circuit. Due to this regulations, the current flowing through the Iron conductor also changed. The reading of the different voltages were recorded and the corresponding current. Resistance was determined from the obtained recordings of the voltages and current. In the graphs obtained by plotting resistance against the length, it can be seen clearly how the length is proportionally related to the resistance. As the length increases so do the resistance. It clearly shows that our graph obeys Ohms law since the line passes