5F20.85 - Frequency in Parallel and Series Circuits

Parallel RC Circuit
Series RC Circuit
Code Number:
5F20.85
Demo Title:
Frequency in Parallel and Series Circuits
Condition:
Excellent
Principle:
Frequency in RC and RL circuits
Area of Study:
Electricity & Magnetism
Equipment:
Decade Capacitor Box, Decade Inductor, #40 light bulb in socket, Wave Generator, Pyle PT-610 Amplifier with 70 volt outputs.
Procedure:

Connect the 70 volt outputs of the amplifier to the light bulb and plug the wave generator into the Aux. input.  Set the wave generator to the 0 to 11 KHz. scale.  Turn the Aux. input channel up to just over 1/2 way and the master volume on the amplifier to about 10 % on or until the light bulb is at maximum brightness.  WARNING:  TOO MUCH AMPLIFICATION WILL BURN OUT THE LIGHT BULB.  Put either the capacitor set at .3 uf or the inductor set at 100 mH in parallel with the light bulb.  Note that in this configuration you can adjust the frequency between 1K and 11K without changing the brightness of the light bulb.  Now connect either the capacitor or inductor in series with the light bulb.  Note that with the capacitor in series the bulb will get brighter as the frequency goes up, and that with the inductor in series the bulb will come on at a low frequency and go out again after the frequency goes up several KHz.  

Disclaimer: These demonstrations are provided only for illustrative use by persons affiliated with The University of Iowa and only under the direction of a trained instructor or physicist.  The University of Iowa is not responsible for demonstrations performed by those using their own equipment or who choose to use this reference material for their own purpose.  The demonstrations included here are within the public domain and can be found in materials contained in libraries, bookstores, and through electronic sources.  Performing all or any portion of any of these demonstrations, with or without revisions not depicted here entails inherent risks.  These risks include, without limitation, bodily injury (and possibly death), including risks to health that may be temporary or permanent and that may exacerbate a pre-existing medical condition; and property loss or damage.  Anyone performing any part of these demonstrations, even with revisions, knowingly and voluntarily assumes all risks associated with them.