Posted: September 13th, 2017

Lab Report sample: resistance and capacitance

Guideline to writing a quality lab report

A lab report needs to have a clear and precise method of illustrating a scientific idea. It must contain the title, followed by the abstract. Here you state the purpose and the findings of the research. Then, have a clear objective, which should be rephrased so as: ‘to investigate, demonstrate.’ The introduction covers an overview of the theory. The methods section presents the actions done during the practice, present the results where graphs, tables or charts are recommended. Then, you have to discuss the results and relate the outcomes to theory. Finally come up with a clear conclusion.

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sample of a lab report

Experiment 4: Resistor Capacitor Circuits
Name
Institution

Objective
The objective of the experiment was to measure the time constants of typical RC circuits, and study the correlation between time constants and frequency response, using an oscilloscope.

Theory
Consider a resistor and a capacitor in series, as shown in Fig. 1. Suppose points A and C have constant voltages, VA and VC, respectively. Then the voltage at point B, VB, is either the same as the voltage at point A, or it is approaching it exponentially:
If the voltage at point B approaches that at point A exponentially in time, how did it ever get to be different from A? There are two possibilities:
1) Although the voltages on points A and C are constant now, they may have changed in the recent past.
2) Although nothing is connected to point B now, something may have been connected in the recent past.
Procedure
1. The circuit was connected as in figure 2, using as an input a 0 to 3 volts square wave from the function generator at a frequency of 100 Hz. The oscilloscope was set to trigger externally from the function generator, at a sweep speed of 1 msec/division. The output at different sweep speeds was examined and the waveforms observed sketched.
2. The circuit was connected as in figure 3and the measurements repeated as in the above procedure. The waveforms were sketched at the different frequencies.
3. In the circuit in figure 2, the square wave was replaced with a 3 volt p-p sine wave input. The output of the circuit was measured for a 1 volt p-p input for about 10 frequencies between 50 Hz and 500 Hz.
4. The frequency measurements were repeated with the circuit in figure 3. The output of the circuit for a 1 volt p-p input for about 10 frequencies between 50 Hz and 500 Hz were measured.

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