4) An 80 ?F 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?
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The time constant is the time it takes for the voltage across the capacitor to decrease to approximately 36.8% of its initial value. From the graph, we can see that the voltage drops from 30 V to around 11 V (approximately 36.8% of 30 V) in 10 ms. So, the time Show more…
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