Phys 152 Resistance Lab

In: Science

Submitted By AMore62
Words 420
Pages 2
Our analysis showed a near linear relationship between current and voltage for the resistor, as expected. Our experimental error for the factory versus actual resistance was only 4.77%. The resistance of the light bulb is not as linear as with the resistor. This is because the resistance changes when the light come on, as some of the energy is converted to heat in the filament. The critical point when the light first turns on is at O.456 Volts and you can see on the graph that the resistance begins to level off at this point. You can see the same point on the graph of current versus resistance because the line begins to curve at the corresponding critical point of 0.390 Amps. As the light gets brighter, more energy is lost as heat and the curve levels off even more.
Conclusion:
In the lab we measured resistance in a resistor and in a light bulb. We built a circuit and used an ammeter and a voltmeter to measure the current and the electric potential difference to measure resistance. The resistor has a linear relationship between current and resistance because resistance does not change as the current increases. However the light bulb is not linear because some energy is lost as heat in the filament when the light bulb comes on. Our experimental data confirms these hypotheses and you can see the point where the light bulb comes on and the line starts to curve on our graph.
Lab Questions:
1. Electric resistance in materials is caused by energy being lost to heat when there are collisions with free electrons and atoms. This property of materials to oppose the flow of electrons is what makes some materials have a higher resistance than others.
2. Ohm’s Law states that the current through a conductor between two points is directly proportional to the potential difference, and inversely proportional to the resistance across the two points. In other words, the current…...

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