Study of capacitors in charging And discharging processes 1

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Title:                     Study of capacitors in charging            

                               And discharging processes                                  

Date of Experiment:            2007/03/21    

Objective:

  • To study the factors affecting the charging and discharging processes of capacitors
  • To observe the charging and discharging currents

Apparatus:

Result:

  1. Study of capacitor in charging

Firstly, a 470μF capacitor was connected to a 1.5V battery with 1000Ω resistor and a centre-zero galvanometer as shown below. Then the reading of the galvanometer was observed when circuit was completed.


When the circuit was completed, the reading of the galvanometer increased from 0mA to 1.14mA instantaneously at once. Then the reading decreased to 0mA gradually.

  1. Study of capacitor in discharging

Both sides of the 1.5V cell was connected it a wire shown by the dash line in figure above. Then the reading of the galvanometer was observed when circuit was completed.

        When the wire was connected, the reading of the galvanometer decreased from 0mA to –1.14mA instantaneously at once. Then the reading increased to 0mA gradually. The case was similar to Part A of the experiment but with opposite direction.

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C. Investigation of factors affecting charging and discharging

Part A and B were repeated with the other capacitors (100μF, 220μF, 470μF, 1000μF) by using a 6V battery ( 4 x 1.5V). The readings of the galvanometer were observed and recorded, and then tabulated below.

The steps were repeated with the other voltages (1.5 V, 3.0V, 4.5V and 6.0V) by using a 470μF capacitor. The readings of the galvanometer were observed and recorded, and then tabulated below.

The step above was repeated but without discharging the capacitor after connecting each battery. The readings of the ...

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