Circuitslab7

# Circuitslab7 - Author Abdul Course Electrical Engineering...

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Author: Abdul Course: Electrical Engineering Lab EE-P202 Experiment 7: “RC Time Constants”

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Objective : The objective of this experiment was to observe the time constants in an RC circuit. Equipment : The equipment in this lab included a digital multi-meter, a DC power supply, two 100 micro Farad capacitors, and two 100 kilo-Ohm resistors. Procedure : The procedure for this experiment was quite extensive. Particularly since there is so much caution that must be taken when dealing with a charged capacitors. This is because a charged capacitor can produce a harmful shock. Accordingly, it is important to discharge the capacitor and that is done by disconnecting the power supply and by placing a jumper wire directly across the capacitor for a few seconds. Any spark hat emerges from discharging the capacitor should not be a concern, since it is likely that it can happen. Furthermore, the procedure for the lab continues by setting up the circuit described in Figure 7.1. Since we are dealing with an RC circuit it is important to note that the time constant is represented by τ . Moreover, the time constant equation is τ =REQ*CEQ, where the time constant is measured in seconds, the resistance is the thevenin resistance seen by the capacitor, and the capacitance is the equivalent capacitance in the circuit. In addition, it is possible to have more than one time constant in a circuit, since there could be a time constant when a capacitor charges and a different time constant when it discharges. In this lab, we use the equation to find CEQ, we use the DMM to measure REQ, and we record the final value of τ by seeing how long it takes the capacitor to reach 63.2% of its final value. Moreover, for Figure 7.1 turn on the power supply and see how long it takes for VC to reach 63.2% of its’ final voltage. The final voltage is 20 Volts in this case. Being that there is great possibility of human error
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Circuitslab7 - Author Abdul Course Electrical Engineering...

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