Physics of a Light Bulb

physical science of a exculpated lightmedulla Catherine Bellet Lab Partners Natalie Russell Alex Harris TA Chad Lunceford PHY 114 TH 225pm Abstract Ohms impartiality states, via the equation V=I*R, that the emf be across a piece of satisfying is proportional to the afoot(predicate). If the temperature lodges constant therefore the resistance is prepare to remain constant. Stefan-Boltzmann law states that when the temperature if preceding(prenominal) an average of 1000K, then the simileship of voltage and genuine should be found to be consistent with the formula AT4.The experimental info found in this, Physics of a Light Bulb, experiment twain correlates and verifies the Stefan-Boltzmann law. The voltage and latest were found to be proportional to one another, confirming Ohms law. In addition, the accompaniment that radiation outside from the light medulla is thusly proportional to the quaternate former of temperature was discovered and again confirm through a linear fit graph. The percentage error found surrounded by the cardinal experimental B look ons was found to be an average 6%. This showing proving that the experiment was decently accurate.Objective To measure the relation between voltage and current in a small blowlamp bulb to checker the temperature of the filum to verify the Stefan-Boltzmann law of radiation. Procedure go the experiment by correctly setting up the circuit. Using the DMM set, come up the resistance of the cold filament of the bulb at room temperature. easy a pre-set experiment file, than connect the circuit to the bulb. Slowly increase the railroad siding signal from the power supply, as the voltage reaches 10V, immediately bring the power supply back down to zero.There should be an observed preserve info and graph in the experimental file. From the recording, highlight the resistance of the cold filament from the data which corresponds to the current ? 0. 08A. Apply a linear fit which in return w ill give the slope, which represents the bulb resistance. Copy and paste the recorded data into Graphical Analysis, insert various mensurable columns, in hostel to find the temperature of the hot filament and to test the relationship versus power and temperature. buy up for a second set of data.Use the graphs to conclude if the Stefan-Boltzmann law is obeyed. Experimental selective information See attached graphs. Results Resistance of Cold Filament Experimental Bulb Resistance % Difference B1 from Graph1(W/K) B2 from Graph2(W/K) % Difference Theoretical B (W/K) % fracture of B1 % Error of B2 2. 5? 2. 46? 1. 61% 4. 26 3. 76 12. 5% 4 6. 19% 6. 33% Data Analysis Discussion The objective of the lab, Physics of a Light Bulb, was to measure the relationship between voltage and current in a small light bulb, be able to determine the temperature of the filament. nd to verify the Stefan-Boltzmann law of radiation. After completing the lab, the relationship between both the voltage and current was found to be linear, as capacious as the current is below or at 0. 08 A. This correlation proves Ohms law therefore current through a metal managing director is proportional to the applied voltage. Through measurement and observations of the printed graphs, the temperature of the filament of the light bulb was found to be around the pass judgment of 1300K.Using the data supplied from the new calculated columns, the verification of the Stefan-Boltzmann law of radiation was prove to hold true. The law states that when the temperature is above an average value of 1000K, then the relationship between voltage and current is consistent with the formula AT4. When analyzing the curve fit of the power versus temperature graph, it is indeed observed that the experimental value given corresponds with the theoretical function that the power radiated away from the light bulb is surely proportional to the fourth power of temperature.The percent error observed for both experimental B values, when compared to the theoretical value of 4, shows to be an average of 6%, not a large value of error present. Therefore, the overall system present in the experiment proved to be both precise and accurate. Considering the percent difference between the two experimental resistors was found to be a mere 1. 61%. The percent difference between the two experimental B values was that of a higher value, 12. 5%.This may indeed have been caused by the fact that the sectioning of data for the second B value was less accurate than that of the kickoff B value. Conclusion At the conclusion of the experiment, Physics of a Light Bulb, the objective was surely met. The goal was to distinguish the relationship between voltage and current, as well as finding the temperature of the filament, and also to verify the Stefan-Boltzmann law of radiation. Through experimental values, it was observed that the relationship of voltage and current is found to be linear when the current is at or below 0. 8A. The temperature of the filament was also observed to be an average of about 1300K and greater. By victorious the values of the Power versus Temperature graph, and creating a new Power versus Temperature raised to the fourth graph and thus applying a linear fit, the relationship of voltage and current was found to be consistent with AT4 and verifying Stefan-Boltzmann law of radiation. Current is indeed proportional to the applied voltage.