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Purpose:To demonstrate the time constant of an RC circuit and its dependence on R and C.
Procedure:Connect R and C in series and use the PASCO generator's square waves as a signal source. Start with 100Ohm resistor and 0.47uF capacitor and display the voltage across the capacitor (see 2nd picture). Vary the values of C and R (provided) to show the change of the time constant. Show the voltage across the resistor to demonstrate the current dependence in the circuit (see 3rd picture). A schematic of the set up is shown below (4th picture).
Hints:To reduce the time constant two resistors could be quickly put in parallel by stacking them on top of each other.
Use differential input oscilloscope to display both the charge and the current dependence.
A camera pointing at the scope's screen is available for the use in room 203.
Comments:If you have a suggestion for the use of this demo which might benefit others, you can enter it below.