Experiment: Kirchoff's Rule

Topics: Resistor, Electrical resistance, Series and parallel circuits Pages: 4 (882 words) Published: August 28, 2013

Caselyn De Guzman, Rosalinda Gelotin and Alyssa Camille Nano University of the Philippines Baguio, Department of Physics, Physics 102.1 c


This paper aims to validate the Kirchhoff’s rule by comparing and accounting for discrepancies between the calculated and measured values i.e. the current and the potential difference across a network of resistors. The experiment is done by creating a circuit with three resistors of varying resistances (1000Ω, 470Ω, & 250Ω) connected to two nine volt batteries. Using the DMM, the current and potential difference can be experimentally measured and via Kirchhoff’s first and second rule, the unknown values can be theoretically measured. With these values, we can compute for the percent error which are [insert the calculated percentage error.] Furthermore, these little errors signify the accuracy of Kirchhoff’s rules.


Electrical circuits are generally constructed to perform specific tasks such as powering a light bulb or adjusting the volume of a television. These circuits are usually assembled with more than two electrical components e.g. resistors, transistors, and capacitors that are connected together. Circuit components can be connected to one another in three ways: series, parallel, and series-parallel. Consider the figures shown below.

Fig. 1. Circuit components connected in (a) series, (b) parallel, and (c) series-parallel. [1] In a series connection, the same amount of current will flow through each circuit element. That is, these elements are connected in such a way that there is only one path for the current. This implies that if the circuit is broken, none of the load devices will work. [2] A parallel circuit, on the other hand, has more than one path for current to flow. The current flowing through each branch in this connection is different but the same voltage is applied through each. [3] The series-parallel circuit is just the combination of the first two. Circuits...

References: 1. Sullivan K. Autoshop 101: Electrical Circuits. Retrieved from http://www.autoshop101.com/forms/h2.pdf
2. Buchla D. Experiments in Electronics Fundamentals and Electric Circuits Fundamentals Fourth Edition. © 1998 by Prentice-Hall, Inc. Simon & Schuster/A Viacom Company, Upper Saddle River, New Jersey 07458
3. WiseGeek Website. What is an Electrical Circuit? Retrieved from http://www.wisegeek.org/what-is-an-electrical-circuit.htm
4. Jewett J. W., Serway R.A. Physics for Scientists and Engineers 6th Edition. Thomson Brooks/Cole © 2004
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