Laboratory Investigation into the Resistance of a Filament Bulb

5/2/2006 Aim: Does the guard of a strand light incandescent lamp diversify as the light light medulla oblongata bunks brighter? Hypothesis: I believe that a chain incandescent lamp will have an increasing resistance depending upon the genuine electric discharge through and through it. Equipment: *Power Supply *Wires *Ammeter *Voltmeter *Filament bulb with holder *Alligator clips *Switch Method: 1.Set up the circuit accord to the schematic diagram 2.Use the alligator clips to connect the filum bulb to the voltmeter 3.Connect the personnel fork out to the electricity 4.Make sure the switch is closed. 5.Measure and rail line down the temperature of the bulb with the thermometer 6.Turn on the power of the power supply 7.Measure down the P.D (v) and rate of flow (a) and the temperature as you growing by .50 each time until 4.50 volts Diagram: Variables: Controlled Variables: Filament bulb of the aforesaid(prenominal) type Independent Variables: Voltage Dependant Variable: reliable (that is what was measured due to the electromotive force change), Temperature (increased as bulb got brighter) Results: P.D. emf (v)Trial 1 Current (a)Trial 2 Current (a)Average Current (a)Trial 1 Temperature (Celsius) Trial 2 Temperature (Celsius) Average Temperature (Celsius)Bulb Brightness (scale 0-10) 0000202020Off 0.50.060.060.06202020 10.090.080.08520.320.520.4 1.50.10.10.120.520.520.5 20.120.120.122121.221.1 2.50.140.140.1421.521.521.5 30.160.160.16232323 3.50.170.170.1723.523.523.5 40.190.180.18524.22424.1 4.50.20.20.2252525 Analysis I plotted my information on a represent with the P.D. on the Y axis and the Current on the X axis. In this right smart the slope of the graph is the resistance of the bulb. feel at my graph I decided that there argon thee interrupt lines that could approximate the graph. The slope of these trine lines gives 3 varied resistance values for the filament bulb. The resistance of the bulb increas es as the officer through the bulb increas! es.

From the information of my table from my results I call attention that the temperature increase corresponds with the increase in the current musical passage through the bulb. My explanation why the resistance change is that as the bulb has to a greater extent(prenominal)(prenominal) current passing through it, this induces it hotter. This affects the filament molecules which a vibrating at a faster rate taking up to a greater extent space. This increases the resistance of the bulb since the current has more obstacles in its focusing. end My hypothesis is correct my resistance changed due to the current passing through the filament bulb. Specifically I could mystify three reg ions of resistance in my graph. R1=8.33Ω , R2=25Ω, R3=33.33Ω. Evaluation A way to rectify this try out would be to have more data points and increase the voltage by smaller amounts. This would make my graph more accurate in finding the slope. A way that this experiment could be extended is by victimization diametric types of filament light bulbs that have different settings for different voltage. I could in addition increase the potential divergence passing through the bulb as an extension. Another way to determine the relationship of the temperature is to warmheartedness the bulb in a different matter such as in a oven and seeing how the temperature relates to the resistance. If you want to get a full essay, devote it on our website: OrderEssay.net

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