Write Up & Data Analysis Questions 1. The uncertainty on the DMM is more precise than the tolerance given by the manufacturer. Looking at our Logger pro file, we see that the uncertainty values are 0.2, and two 0.02 ohms which is more precise then 5% (so 11.125 for R1, 2.419 for R2, and 2.906 for R3). We must use the reading errors for the calculations meaning it is more relevant. 2. The benefit of determining equivalent resistance graphically by taking a set of voltage/current data then plugging a single V and I measurement and plugging them into the formula V=IR is that the graphic interpretation given by the stats have a correcting nature to them. By taking a whole set of measured data and using those to calculate I/V we can find the mean of all the data. This mean is a more accurate representation then any single value pair calculation. 3. You can not apply equations 2.8 and 2.9 directly to the whole circuit but for a sub-selection of the circuit we could use those two equations. For example, in our lab we could apply that R2 and R3 are a series and use the series equation to calculate that portion and then we could use the fact that R1 and R2+R3 are parallel and use the parallel equation for that part. 4. Resistance is the property of a material with respect to current going through it. It is a made object an where we calculate how much resistance that object is providing. Resistivity is the characteristic of a material. Resistance describes a resistor whereas resistivity describes the material. The resistivity of a metal wire is dependant of the temperature. Atoms of the metal wire are in a lattice oscillating in place and as the temperature increases, these oscillations go up in amplitude. This causes the resistance to increase as well. 5. From my resistivity calculations in B4 I conclude that the wire is made of carbon (Table of Resistivity, 2022). 6. Works Cited - Hyperphysics.phy-astr.gsu.edu. 2022. Table of Resistivity. [online] Available at: <http://hyperphysics.phy-astr.gsu.edu/hbase/Tables/rstiv.html> [Accessed 6 February 2022].
