Charging and Discharging a Capacitorrrr

Charging and Discharging a Capacitorrrr - Charging & D...

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Charging & Discharging A Capacitor
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PURPOSE To charge the capacitor that is initially uncharged, and then discharge it. Getting a time record of the current in the charging and discharging circuits, we are going to plot the charging and discharging currents as a function of time. INTRODUCTION In the previous experiments, we work on circuit with constant and unchanged currents, yet in this experiment we will change current in time. While doing this, capacitor will be used in the circuit. A capacitor is a circuit member accumulating charge when linked the circuit thus this accumulating charges give growth of voltage difference across its terminals. Capacitors include two conductors separated by a insulator and it accumulates same and opposite +Q and –Q at its conducting plates. When we mention about charge, we imply positive charge +Q. When capacitor has a charge, there will be a voltage difference V across its plates. This voltage difference is such that the ratio of Q and V for any Q is always constant. This constant C is called the ‘capacitance.’ C=Q/V Q is measured in coulombs and V in volts, the unit of capacitance C is the Farad.
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A charging circuit of an initially uncharged capacitor is shown in figure above. When the switch is closed at t:0, a current I starts to flow into the circuit and
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This note was uploaded on 03/31/2010 for the course PHYSICS 113 taught by Professor Atılgan during the Fall '09 term at Middle East Technical University.

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Charging and Discharging a Capacitorrrr - Charging & D...

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