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Experiment E18 Electromagnetic Oscillation and Resonance |
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| Description | ||||||||||||||||
| In this activity, you will use an LC oscillator to generate an a.c. current. Damping is introduced using variable resistor so that you will obtain traces of under-damped, critically damped and over-damped oscillations. Square wave is used to cause oscillations at the rising and falling edge of square wave. You will also study the voltage at the point of resonance for an LRC circuit.
In Experiment 1, you will apply a square wave to an LC oscillator. The period of the square wave should be long enough for several cycles of the damped oscillation to be displayed using a CRO.
In Experiment 2, you will notice the illumination of a light bulb in an LRC circuit driven by a signal generator at various frequency. The illumination of the light bulb will be the brightest when resonance occurs.
In Experiment 3, you will use the same settings as in Experiment 2, except that you will replace the light bulb with a variable resistor and connect a neon bulb across the capacitor. |
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