EECS 40 RC Circuits EECS 40 Pre Lab RC Circuits Name TA Section Please read the lab manual first then show your work here V Q C i t dt C Differentiating this equation we obtain i t C dV dt 1 If a constant current of 1 0 mA were to flow into a 200 F microfarad capacitor what would be the voltage across the capacitor after 3 seconds 2 Describe what would happen theoretically if you were to connect an ideal current source to the following circuits Use time plots of the voltage across the capacitor and the resistor to illustrate a R C 1 EECS 40 RC Circuits b R C 3 An RC resistor capacitor circuit will have an exponential voltage response of the form v t A B e t RC where A and B are constants that express the final voltage and the difference between the initial voltage and the final voltage respectively a Given R 10 k and C 0 1 F a starting voltage of 5 Volts and an ending voltage of 0 Volts what will the voltage be at t 1 ms b At what time will the voltage be 0 5 Volts 4 Suppose you were given two black boxes which have either a series or parallel combination of R and C In the case of the series RC you would not be able to touch a probe between the R and the C in the black box so how would you go about determining R and C using the signal generator the oscilloscope and an external resistance Hint read the lab 2
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