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Experiment E15 Investigation of Low Voltage Power Supplies |
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| Description | ||||||||||||||||||
| In this activity, you will study two commonly used low voltage power supplies in the laboratory. You will learn how pulsating d.c. is converted into a smooth d.c. using a pair of capacitor and an inductor.
In Experiment 1, you will study the Westminster low voltage power supply using a 3 V light bulb. Then, you will measure the voltages across various pairs of output terminals using appropriate moving coil voltmeters.
In Experiment 2, you will use both the a.c. and d.c. ouptuts of the 12 V low voltage power supply. You will compare the illuminations of a light bulb connected in turn to the a.c. and the d.c. outputs, using the same marked output voltage. In each case, you will measure the voltage using appropriate voltmeter.
In Experiment 3, you will display the waveform of the a.c. and d.c. output of the 12 V low voltage power supply. You will measure the peak to peak a.c. voltage and the maximum d.c. voltage. In each case, the results would be compared to the marked values.
In Experiment 4, you will study the use of smoothing unit in converting an a.c. to d.c. You will display the waveform of the voltage in each stage of the smoothing process. You will also compare the voltages at the input and output terminals of the smoothing unit. |
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| Apparatus | ||||||||||||||||||
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