ESET210Prelab1516

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Texas A&M University *

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210

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Electrical Engineering

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Feb 20, 2024

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1 Texas A & M University Pre-Lab Experiment 15&16 ESET 310-508 Contact: Caleb Sparks (729009916)

2 Pre-Lab Experiment DC 15: Capacitors Purpose: In this experiment, students will be able to calculate the time constant of a series R-C circuit. They will also work to calculate the time constant current after five time constants which defines the steady-state of the circuits. Students will also determine the capacitance and energy stored of a capacitor then perform a simulation of a RC circuit. Materials: Resistors: 2 1.2-kΩ, 100-kΩ, ¼-W film resistors 3 3.3 k-Ω, 47 k-Ω (¼-W film resistors) Capacitors: 1 100-uF and 220-uF (electrolytic) Instruments: 1 DC Power Supply, 1 DMM (Digital Multimeter), and 1 single-pole single-throw switch Procedure: 1. Basic Series R-C Circuit: Construct the circuit shown in Fig 15.1, find measured resistor values, and note polarity. Use calculations to find the steady state values of I, V1, and V2 then measure each. Find the energy stored by the capacitor, then turn off the voltage supply and determine if there is a reading. Finally, short the capacitor and measure VC. Draw any necessary conclusions and record values in the appropriate table. 2. Parallel R-C dc Network: Construct the circuit shown in Fig 15.2, find measured resistor values, and note polarity. Use calculations to find the theoretical steady state values for all currents and voltages then measure each. Energize the circuit, measure V1- V3, then use the voltages to calculate I1-I3. Draw any necessary conclusions and record values in the appropriate table. 3. Series-Parallel R-C dc Network: Construct the circuit shown in Fig 15.3, find measured resistor values, and note polarity. Assume ideal capacitor levels and resistance, then calculate the theoretical currents and voltages. Energize the system and measure voltages V1-V4. Draw any necessary conclusions and record values in the appropriate 4. Determining C (Actual Value) : Construct the circuit shown in Fig 15.3, find measured resistor values, and note polarity. Calculate the time constant using measured resistor values and capacitance value. Discharge the capacitor then energize the source and record how much time has passed until VC is 63.5% of final. Determine Cmeasured, repeat the process for the 220-uF capacitor then compare the values. Draw any necessary conclusions and record values in the appropriate

3 Pre-Lab Experiment DC 7: Parallel DC Circuits Purpose: In this experiment, students will determine the time constant of an R-C network, find the charging voltage of the two capacitors both in series and in parallel. In each of the two scenarios, students will find the resultant voltage across resistors and verify Thevenin’s theorem by charging a capacitor. Materials: Resistors: 1 47-kΩ ¼-W film resistors 2 100 k-Ω (¼-W film resistors) Capacitors: 2 100-uF and 220-uF (electrolytic) Instruments: 1 DC Power Supply, 1 DMM (Digital Multimeter), and 1 single-pole single-throw switch Procedure: 1. Charging Network (Parallel Capacitors): Construct the circuit shown in Fig 16.1, find measured resistor values, and note polarity. Calculate the total capacitance, time constant, and charging time. Find VC and VR across various time intervals then graph them. Determine the equation used to calculate VC. Determine the difference between the measured and theoretical values of VC at t=25. Draw any necessary conclusions and record values in the appropriate table. 2. Charging Network (Series Capacitors): Construct the circuit shown in Fig 16.2, find measured resistor values, and note polarity. Calculate total resistance, capacitance, time constant, and charging time. Find VC and VR across various time intervals then graph them. Determine the equation used to calculate VR then compare graphed VR versus theoretical. Draw any necessary conclusions and record values in the appropriate table. 3. Applying Thevenin’s Theorem: Construct the circuit shown in Fig 16.3, find measured resistor values, and note polarity. Calculate the thevenin’s resistance and voltage from terminals a to b. Redraw the circuit with the thevenin's equivalent then calculate the time constant and charging time. Record the equation used for VC after one time constant. Close the switch and repeat. Compare the values and determine if thevenin’s theorem was validated. Draw any necessary conclusions and record values in the appropriate table.

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