Measurement of capacitance by reed switch

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C10   Measurement of capacitance by reed switch

Procedure

1.        Connect the circuit. Set the resistance of the variable resistor at its maximum value. Record the reading of the voltmeter.

                Voltage = ______ 5.9 __________V

4.        Decrease the resistance of the variable resistor slowly until the current shown on the microammeter does not increase any more. Record the reading of the microammeter.

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5.        Repeat steps 3 and 4 with the other frequencies of the signal generator from 400 Hz to 10 Hz. Tabulate the results.

        Note that low switching frequency is advised since for high one, the reed switch may not be sensitive enough to respond, and the time may be too short for complete discharge.

6.        Plot a graph of frequency (f) against current (I).

Results and Discussion

1.        Why the charging and discharging of the capacitor must be complete?

If the charging of the capacitor is not complete, the voltage of the capacitor will not reach

that measured by ...

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