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124-06 AC Ciutcuits

# 124-06 AC Ciutcuits - _AC Circuits PHYSICS 124 EXPERIMENT...

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_____AC Circuits PHYSICS 124 EXPERIMENT NO. 6 AC CIRCUITS The Oscilloscope The oscilloscope is an instrument which measures voltage as a function of time. While a few oscilloscopes now use liquid crystal displays (LCD), most oscilloscopes (including the ones you will use) accomplish this by using a cathode ray tube (CRT). Cathode ray tubes have been around for more than a century, yet they still are basic components used in television sets and computer displays. The oscilloscope drives the electron beam around by changing the electric field between two conducting plates and thus provides an electrostatic force = q to a charge q . Two sets of plates are used; one set drives the electron beam up and down depending on the value of an input voltage, and other set drives the electron beam from left to right with time. This measurement is usually repeated many, many times a second, so that to the eye it appears as if a constant pattern were being traced on the oscilloscope just like the eye perceives a rapid sequence of still pictures as a “motion picture” or movie. RC Circuits You will now use the oscilloscope to study some properties of alternating current (AC) circuits using capacitors and/or inductors. Unlike simple, direct current (DC) components like resistors, the behaviors of these circuit components depend on the rate of change of the input voltage/current (i.e., the frequency of the driving

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