Contains

410 words

410 words

Category

Science & Nature

Science & Nature

ABSTRACT

Ohm's Law and Kirchhoff's rules is fundamental for the understanding of

dc circuit. This experiment proves and show how these rules can be applied to

so simple dc circuits.

INTRODUCTION

In the theory of Ohm's Law, voltage is simply proportional to current as

illustrated in the proportionality, V=RI. As shown in this relation, V

represent voltage which is the potential difference across the two ends of a

electrical conductor and between which an electric current, I, will flow. The

constant, R, is called the conductor's resistance. Thus by the Ohm's Law, one

can determine the resistance R in a DC circuit without measuring it directly

provided that the remaining variable V and I is known.

A resistor is a piece of electric conductor which obeys Ohm's Law and

has been designed to have a specific value for its resistance. As an extension

of the Ohm's Law, two more relationship can be drawn for electric circuits

containing resistors connected in series or/and parallel. For resistors

connected 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 can

be analyzed to find the current and voltage at each point of the circuit using 2

basic rules formulated by Kirchhoff. 1) The algebraic sum of current at any

branch point in a circuit is zero. 2) The algebraic sum of potential difference,

V, around any closed loop in a circuit is zero. These rules and equations

provided by the Ohm's law and the Kirchhoff rule can be experimentally tested

with the apparatus available in the lab

EXPERIMENTAL METHOD

The apparatus used in the experiment includes a Voltmeter, an Ammeter,

some connecting wires and a series of resistors and light bulb with varies

resistance. This experiment could be divided into 5 sections which value of

voltage and current measured is noted in all sections for further calculation.

In the first section, in order to evaluate the reliability of Ohm's law, a dc

circuit was constructed as FIG 2 (on p.4 ) using a resistor with an expected

resistance at 2400W*120W. In the second section, we were instructed to

determine the internal resistance of the voltmeter. Two dc circuit ...

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