PHY 134 Labs - PHY134 Capacitors Page 1 of 3 PHY134 -...

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In this experiment we will determine the capacitance of an unknown capacitor by observing the change in potential difference between its plates when, after being initially charged, it is connected in parallel with a known capacitor. We will also study the behavior of capacitors connected in series. Equipment z Oscilloscope, z Unknown capacitor, z Decade capacitance box with 1 μ F steps, z Double-pole double-throw switch, z Dry cell. Method In Part I, a capacitor C 1 is charged to potential V 0 by connecting it across a dry cell. The cell is disconnected and then an initially uncharged capacitor C 2 is connected in parallel with C 1 . Charge will flow from C 1 to C 2 until the potentials across the capacitors equalize. The voltage across the parallel combination is given by: Q1. Derive equation (1) Rearranging equation (1) gives: C 2 is an adjustable capacitor. As C 2 is changed, the final voltage V will vary according to equations (1) and (2). In Part II, a similar procedure is applied to capacitors connected in series.
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This note was uploaded on 04/14/2010 for the course PHY 134 taught by Professor Gurvitch,m during the Spring '08 term at SUNY Stony Brook.

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PHY 134 Labs - PHY134 Capacitors Page 1 of 3 PHY134 -...

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