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Calculations and comparisons Experiment 8

# Calculations and comparisons Experiment 8 - This is due in...

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Appendix A COMPARISONS AND CALCULATIONS A-1

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Calculations and Comparisons 1. A. The Thevenin Equivalent of the first circuit with the 120kΩ resistor is as follows. Multi-meter was rated with an 11MΩ resistance value. Figure 5 is an example of Thevenins Equivalent for both circuits and is used as a reference for both of resistor calculations. Figure 5. Thevenin Equivalent V oc = 15.14 V R th = [(120.8kΩ)*(11MΩ)]/[120.8kΩ+11MΩ]=119.5kΩ B. The Thevenin equivalent of the second circuit with the 68kΩ resistor. Multi-meter was rated with an 11MΩ resistance value. V oc = 15.14 V R th = [(68kΩ)*(11MΩ)]/[68kΩ+11MΩ]=67.9kΩ A-2
2. The calculated time constant for both circuits are as follows: First circuit: τ = R*C, τ =119.5kΩ*270µF=32.26s Second circuit: τ =R*C, τ =67.9kΩ*270µF=18.32s 3. Figure 6 shows a graph of the RC charge. The τ values for both resistors are substantially different than those of our calculated values.

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Unformatted text preview: This is due in large part to a faulty capacitor and a delay in recording due to human error. Figure 6. RC Charge 4. Figure 7 shows a graph RC discharge curve. The τ values at for both resistors are substantially different than those of our calculated values. This is due in large part to a faulty capacitor and a delay in recording due to human error. Figure 7. RC Discharge 5. Looking at the same time intervals of both resistors. The 68kΩ resistor has a smaller resistance than the 120kΩ. With the smaller resistor in the circuit, the voltage drop across this resistor is less than that of the 120kΩ. Knowing this information, it can be derived that more voltage will be sent to the capacitor. The capacitor will store the delivered A-3 energy at a faster rate than the 120kΩ resistor. This is confirmed in Table II and Table III in the Results section. A-4...
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