Unformatted text preview: E+00 -4.00E+00 ln(I+Io) (amps) -6.00E+00 -8.00E+00 -1.00E+01 -1.20E+01 -1.40E+01 -1.60E+01 -1.80E+01 Voltage (v) y = 20.602x - 23.545 R = 0.99899 Series1 Linear (Series1) 0.40 0.50 0.60 0.70 0.80 Figure 2: Shows the linearized current vs voltage for the diode circuit. This relation will generally be exponential, but in this form we can use a linear regression to calculate an experimental ratio between e and kB. Part III: Resistors in Series and Parallel In this third part we constructed two circuits, one with two resistors in series and one with two resistors in parallel. We measured the actual resistance of each resistor and then measured the equivalent resistances of the two circuits. I'm not sure if we need to include this data, but since we collected it I'll include it below. Table 2: Shows our experimental measurements for resistors in series and parallel Resistance (ohms) R1 99.3 R2 298 (R1+R2) Series 398 (R1+R2) Parallel 74.4 Next I calculated the theoretical series and parallel resistances. Rseries = R1+R2 = 397.3 RParallel= (1/R1 + 1/R2)-1 = 74.48 Table 3: Summarizes the theoretical and experimental series and parallel resistances. Series Parallel Rexp (ohms) 398 74.4 Rth (ohms) 397.3 74.48 R 0.7 0.08 R % 0.18 0.11 Part IV: Conductivity of Copper Here we weighed a copper wire in order to find its total length. We then tested its resistance at room temp and after being cooled by liquid nitrogen. It's resistance and resistivity decreased considerably at the cooler temperature. All of the data and calculations are included in my lab notebook as instructed. Week 2: AC Circuits Part I: RC Circuits In this part we created a circuit with a resistor and capacitor in series and applied a transient AC voltage to it. We first measured our resistor and capacitor as shown in Table 4. Our raw data is shown in Figure 3. I chose this circuit to linearize and replot, which is shown in the Analysis section. Table 4: shows the measured values of the resistor and capacitor in the RC circuit R (ohms) 992 C (F) 0.000001 Voltage vs Time 7.00E+00 6.00E+00 5.00E+00 Voltage (...
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- Spring '13
- Resistor, RLC, Inductor, Electrical resistance