EXP 8 Report - EXPERIMENT 8 INTRODUCTION This report...

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EXPERIMENT 8 INTRODUCTION This report details the results of an experiment conducted on October 25, 2007 in the Electric Circuits laboratory on the Arkansas State University campus. This experiment was conducted in order to study the transient response in storing an electric charge on a capacitor in a Resistor-Capacitor (RC) circuit, the transient decay of an initial charge on a capacitor thru a resistor, and to understand the time constant in an RC circuit and how it can be changed. Background/Theory In this lab experiment, the group took a simple circuit and added a capacitor to it to create the RC circuit required for this experiment. A simple circuit consists of a resistor and a voltage source. A resistor is a small carbon film element with a fixed resistance that resists current by creating a voltage drop across its surface through an electric circuit. The voltage source can be a variety of things but for this circuit an adjustable DC power supply was used. In an RC circuit, a capacitor is added to a simple circuit to see the time rate a capacitor will charge or discharge energy. A capacitor is an electronic device that is used in an electric circuit. It can store an electric charge between two metallic plates with dielectric material between those plates. A simple capacitor can have a piece of paper sandwich between two pieces of aluminum with one wire connected to each plate. There are many types of capacitors used in circuits for many different applications. A basic application of a capacitor can be used for energy storage, when the loss of a voltage source in the circuit has happened the capacitor turns into an 1
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independent voltage source for an allotted time. The different types of a capacitor can be vacuum, air, glass, or aluminum electrolytic. In the RC circuit, the voltage across the capacitor is expressed by the phrase “charge” in relation to the equal magnitude of electrodes on the plates but opposite polarity. When the RC circuit is in series, the capacitor will be in equilibrium when the voltage is the same as the voltage source. The capacitor is consider full and that path will be considered an open and no more energy can be stored in the circuit. The voltage across the capacitor is related to the charge by the equation V=Q/C, or expressed as an instantaneous value, dv=dq/C. (1)
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This note was uploaded on 06/30/2011 for the course ENGR 403 taught by Professor Ahn during the Spring '11 term at Birmingham-Southern College.

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EXP 8 Report - EXPERIMENT 8 INTRODUCTION This report...

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