Lab 8 - Capacitance and the Oscilloscope

Lab 8 - Capacitance and the Oscilloscope - Physics Lab Lab...

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Physics Lab Lab 8 – Capacitance and the Oscilloscope Aleksey Zelenberg
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This experiment was aimed at measuring the RC constant (also called the time constant) of various circuit setups (Figs 1 & 2 below). The experiment consisted of two parts. In the first part, we measured the current on five-second time intervals while charging and discharging the capacitor. In the second part, we utilized the Tektronix TDS-210 Digital Oscilloscope to measure a much smaller time constant. Our results in the first part indicate a similarity between the time constants obtained from charging and discharging. Our measured results (τ) from the second part statistically agree with the calculated results (RC). Procedure Fig 1 i Fig 2 The experiment consisted of two parts. In the first part, we used a combination of resistance and capacitance chosen specifically so that the time constant is long enough to allow for current observation with an ammeter. Using this setup (Fig 1), we were able to measure the time required for the current to reach 20 μA, 15 μA, 10 μA, 5 μA. We then plotted log I vs. t (since it is an exponential function and a linear fit is required) to obtain the slope and y intercept. We then used the equation
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Lab 8 - Capacitance and the Oscilloscope - Physics Lab Lab...

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