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# The Importance of Ohm's Law and Kirchhoff's Rules in Understanding dc Circuit

ABSTRACT Ohms Law and Kirchhoffs rules is fundamental for theunderstanding of dc circuit This experiment proves and show how these rules can beapplied to so simple dc circuitsINTRODUCTION In the theory of Ohms Law voltage is simply proportional to currentas illustrated in the proportionality VRI As shown in this relation V representvoltage which is the potential difference across the two ends of a electrical conductorand between which an electric current I will flow The constant R is called theconductors resistance Thus by the Ohms Law one can determine the resistance R in a DCcircuit without measuring it directly provided that the remaining variable V and I isknown A resistor is a piece of electric conductor which obeys Ohms Law andhas been designed to have a specific value for its resistance As an extension of theOhms Law two more relationship can be drawn for electric circuits containing resistorsconnected in series orand parallel For resistors connected in series the sum of theirresistance is RTOTALR1R2 Rn And for resistors connected in parallel1RTOTAL1R11R2 1Rn Complex dc circuit involving a combination of paralleland series resistors can be analyzed to find the current and voltage at each point of thecircuit using 2 basic rules formulated by Kirchhoff 1 The algebraic sum of current atany branch point in a circuit is zero 2 The algebraic sum of potential difference Varound any closed loop in a circuit is zero These rules and equations provided by theOhms law and the Kirchhoff rule can be experimentally tested with the apparatusavailable in the labEXPERIMENTAL METHOD The apparatus used in the experiment includes a Voltmeter an Ammetersome connecting wires and a series of resistors and light bulb with varies resistanceThis experiment could be divided into 5 sections which value of voltage and currentmeasured is noted in all sections for further calculation In the first section in orderto evaluate the reliability of Ohms law a dc circuit was constructed as FIG 2 onp4

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