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Charging and discharging a capacitor Free essay! Download now

Home > A Level > Physics > Charging and discharging a capacitor

Charging and discharging a capacitor

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Downloads to date: N/A | Words: 3065 | Submitted: 26-Oct-2012
Spelling accuracy: 97.4% | Number of pages: 18 | Filetype: Word .doc


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Charging and discharging a capacitor essay previewCharging and discharging a capacitor essay previewCharging and discharging a capacitor essay preview

Description

To study the relationship between the charge on a capacitor and the potential difference applied across it by charging the capacitor at a constant rate

Preview

Experiment 10: Charging and discharging a capacitor
Capacitor: A capacitor is an electrical device for storing electric charge and energy. A capacitor consists of two parallel metal plates and insulator between the two metal plates.
Apparatus:
Capacitors(1mF/10mF/2200mF/1000mF)
Clip box x1
Multimeter(with banana probes) x1
100mA microammeter x1
50k? variable resistor x1
Battery(3v/6v) with holder x1
Stop watch x1
Switch x1
Rheostat x1
1.Charging a capacitor at a constant rate
Introduction: When a capacitor is connected to a battery, the capacitor can be charging. The electrons from the negative terminal of the battery accumulate on one plate of the capacitor and equal amount of positive charges is induced on the opposite plate. The capacitor will be fully charged as the presence of resistance. In this section, we intended to charge a capacitor at constant rate.
Objective: To study the relationship between the charge on a capacitor and the potential difference applied across it by charging the capacitor at a constant rate
Diagram












Assumption:
The resistance in wires, is extremely small by comparing with the rheostat, can be neglect
The resistance in the microammeter is neglect
The internal resistance of battery is neglect

Procedure:
The circuit was connected as follow.
(i) The positive end of battery was connected with the rheostat.
(ii) The rheostat was connected with the positive end of capacitor.
(iii) The negative end of capacitor was connected with the switch
(iv) The switch was connected with the negative end of switch
(v) The positive end of multimeter was connected with the positive end of microammeter and the negative end of multimeter was connected with negative end of capacitor. The multimeter was in parallel with the microammeter and capacitor.
(vi) A piece of copper wire was connected with the two ends of capacitor










2. Then we checked the circuit whether it was correct or not
(i) The polarities of the battery, capacitor, meter were connected correctly
(ii) The capacitor was fully discharged by shorting the ends of the capacitor with a piece of copper wire
(iii) The rheostat was set ...

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