Measuring Unknown Resistances using Different Methods
Peppermint, Kunoichi
MDE
National
Institute of Physics
UP Diliman, QC
I.
Abstract
This experiment is for the purpose of determining the resistance of different resistors without
using the ohmmeter or looking at the color bands. This experiment also applies Ohm’s Law and
Kirchoff’s Voltage and Circuit Law. Current division and loop analysis will also be apply. Three
methods will be use. By using series ohmmeter method, voltmeterammeter method, and the
wheatstone bridge method, three unknown resistors will be measured using these three methods.
II.
Introduction
The ratio of voltage across and the current that passes through a certain metallic conductor is constant,
and this ratio is known as the Resistance (R) of that conductor. This relationship is known as the Ohm’s
Law and is defined mathematically by the equation V=IR, where V is the potential difference in volts (V),
I is the current in amperes (A), and R is the resistance of the conductor in ohms (Ω).
Kirchoff’s current law states that the sum of currents flowing towards a point is equal to the sum of
currents flowing away from that point. While Kirchoff’s vltage law states that the directed sum of the
electrical potential differences around a closed circuit must be zero.
This experiment aims to achieve the following objectives:
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 Winter '07
 BATAC
 Physics, Resistance, Electrical resistance, Kirchhoff's circuit laws, Multimeter

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