Determination of a Capacitance Using Charge-Discharge Method

Aim of experiment
Determination of the capacitance of a capacitor.

Apparatus
capacitor: D.C. Power Supply- Switch Key - Stopwatch

Methodology

Capacitors are widely used in electronic technology for controlling signal amplitude and rise time.

In an RC circuit, in which a capacitor discharges in a resistance, the current is exponentially decreasing with time, and its characteristic time depends on the values of both resistance and capacitance.

In the experiment, the discharging current as a function of time is measured. From the graph, the characteristic time is produced, from which the value of the unknown capacitor is determined.