lab 4 bulbs
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Lab 4: Bulbs Essence The purpose of this lab is to study ohm’s law and observe the direct proportional behavior between voltage and current in light bulbs installed in dierent combinations. In this lab, we use three bulbs installed in seven dierent combinations to observe ohm’s law. According to ohm’s law, voltage is directly proportional to current while resistance is kept constant. So, there is a linear relationship between voltage and current. Analysis rom the e!periment done in this lab with " dierent light bulbs of their seven combinations, we observed the behavior of voltage with current in the form of resistance in each combination and calculated percent errors which are described below# Circuit Setup % Error $ight %ulb A .30 % $ight %ulb % 3.08 % $ight %ulb & 9.08 % A, %, & in series 24.8 % A, %, & in parallel .61 % A series %''& 12 % A''% series & 1.45 % It is observed that systematic error is produced in this lab due to having (ero error in digital multimeter )*++ used in this lab. Systematic error occurs in procedur e section of the lab.
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Transcript of lab 4 bulbs
Lab 4: BulbsEssenceThe purpose of this lab is to study ohms law and observe the direct proportional behavior between voltage and current in light bulbs installed in different combinations. In this lab, we use three bulbs installed in seven different combinations to observe ohms law. According to ohms law, voltage is directly proportional to current while resistance is kept constant. So, there is a linear relationship between voltage and current.AnalysisFrom the experiment done in this lab with 3 different light bulbs of their seven combinations, we observed the behavior of voltage with current in the form of resistance in each combination and calculated percent errors which are described below:Circuit Setup% Error
Light Bulb A.30 %
Light Bulb B3.08 %
Light Bulb C9.08 %
A, B, C in series24.8 %
A, B, C in parallel.61 %
A series B||C12 %
A||B series C1.45 %
It is observed that systematic error is produced in this lab due to having zero error in digital multimeter (DMM) used in this lab. Systematic error occurs in procedure section of the lab.
ConclusionFrom the experiment done in this lab, it is concluded that there is linear relationship between voltage and current in all light bulbs combinations which proves ohms law. It is also concluded that when light bulbs are placed in series with each other, the total resistance of the circuit is the sum of all the resistances, so current decreases while in parallel combinations total resistance is less than the least resistance, so circuit current increases. Mathematical expression for ohms law is defined as
ExpansionYes ohms law is a universal law but it can be applied to only those circuits in where there is direct relationship between voltage and current while keeping the resistance of the circuit constant. An example of a non-ohmic reaction is an RLC series circuit. All the circuits in which an inductor or capacitor is involved are nonohmic.
