Voltage: Ohms Law And Kirchhoffs Rules :: essays research papers

Voltage Ohms Law and Kirchhoffs RulesABSTRACTOhms Law and Kirchhoffs rules is fundamental for the understanding ofdc circle. This experiment proves and show how these rules tramp be applied toso simpleton dc circuits.INTRODUCTIONIn the theory of Ohms Law, voltage is simply proportional to veritable asillustrated in the proportionality, V=RI. As shown in this relation, Vrepresent voltage which is the potential difference across the two ends of aelectrical theater director and between which an electric current, I, will flow. Theconstant, R, is called the conductors resistance. Thus by the Ohms Law, onecan determine the resistance R in a DC circuit without measuring it directlyprovided that the remaining variable V and I is known.A underground is a piece of electric conductor which obeys Ohms Law andhas been designed to have a specific value for its resistance. As an extensionof the Ohms Law, two more relationship can be haggard for electric circuitscontaining resistors connected in series or/and parallel. For resistorsconnected in series, the sum of their resistance is, RTOTAL=R1+R2+ ..... +Rn .And for resistors connected in parallel, 1/RTOTAL==1/R1+1/R2+ ..... +1/Rn .Complex dc circuit involving a combination of parallel and series resistors canbe analyzed to sense the current and voltage at each point of the circuit exploitation 2basic rules formulated by Kirchhoff. 1) The algebraic sum of current at anybranch point in a circuit is zero. 2) The algebraic sum of potential difference,V, around any closed iteration in a circuit is zero. These rules and equationsprovided by the Ohms law and the Kirchhoff rule can be experimentally testedwith the apparatus avai science laboratoryle in the labEXPERIMENTAL METHODThe apparatus used in the experiment includes a Voltmeter, an Ammeter,some connecting wires and a series of resistors and light lightbulb with variesresistance. This experiment could be divided into 5 sections which value ofvoltage and current measu red is note in all sections for further calculation.In the first section, in effectuate to evaluate the reliability of Ohms law, a dccircuit was constructed as physical body 2 (on p.4 ) using a resistor with an expectedresistance at 2400W*120W. In the second section, we were instructed todetermine the internal resistance of the voltmeter. Two dc circuit wereconstructed as FIG 1. and FIG 2. using a resistor with an expected resistance at820000W*41000W. In the third section, we were asked to judge if the filumof a light bulb obey Ohms law, this was done by constructing a dc circuit asFIG 1. with a light bulb instead of a resistor.