Series and Parallel Circuit Elements Essay

1572 Words Nov 29th, 2010 7 Pages
Experiment 8: Series and Parallel Circuit Elements
Laboratory Report

Frenzyl Espinola, Anna Fermin, Loren Gabayeron, Kristal Fernandez

Department of Math and Physics
College of Science, University of Santo Tomas
España, Manila Philippines


The experiment is about the elements of series and parallel circuits. The laws on series and parallel resistors, as well as the color code for resistors were observed to calculate the total resistance. The proper connection for ammeter and voltmeter was also conducted and the readings for the voltage and current were obtained.

1. Introduction

The objectives of the experiment are to determine the resistance of a resistor based on its color code and to verify the laws on
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It is clearly seen in this experiment that in a series circuit, the current through each of the components is the same, and the voltage is the sum of the voltages across each component. On the other hand, in a parallel circuit, the voltage of the components is the same, and the total current is the sum of the currents through each component.

2. You have 4 identical resistors, each with resistance of 5 ohms. Determine all possible resistances that you may get using all four resistors.

For series, one can have a total of 20 ohms, provided with the equation of R= sum of all resistors. The parallel can only have 5 ohms of resistance given also the equation from the theory.

3. The human body is a god conductor, being almost 70% water. A wet dry skin has resistance as high as 104 – 106 ohms. However, when the skin is wet, the resistance drops to 1000 ohms or less. Why? Relate this fact in the operation of a lie detector.

Most of the body’s resistance is in the skin; thus, the dead, dry cells of the epidermis are very poor conductors. However, when the skin is wet, the resistance drops and the skin begins to be more of a conductor because of water, sweat and the presence of electrolytes. In line with this, in a lie detector, the activities of the body not easily controlled by the conscious mind. The body is subjected under different circumstances. Among these are sweating and release of more water. Notice that when we lie, or make something up,

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