Contemporary Introductory Physics Experiments 3. The following graph represents the voltage across a capacitor that is initially charged to a voltage of 10 V and then discharged through a resistor. What is the RC time constant in seconds?
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RC Circuit Discharging Experiment : Results t (sec) | Vc (Volt) 0 | 20.00 30 | 10.98 60 | 6.02 90 | 3.31 120 | 1.81 150 | 1.00 180 | 0.55 210 | 0.30 240 | 0.16 270 | 0.09 300 | 0.05 330 | 0.03 360 | 0.00 Draw a graph of your tabulated results. Find the initial voltage. Determine the time constant.
Sri K.
An 80 μF capacitor that had been charged to 30 V is discharged through a resistor. The following graph shows the capacitor voltage as a function of time. a) What is the time constant for this RC circuit? b) What is the resistance of the resistor?
Madhur L.
In physics lab, Mary measured the voltage across an unknown capacitor in an RC circuit, every ten seconds after a switch in the circuit that allows the capacitor to discharge is closed. The capacitor was initially fully charged. Using the graph, estimate the time constant. Equation: Time constant, RC = t / ln(Vmax / V)
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