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lab 3 phys

# lab 3 phys - The total resistance was measured and the...

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Conceptual Questions 1. The parallel resistors have a smaller resistance because resistance of resistors in parallel equals (1/r1+1/r2)^-1 and resistance of resistors in series equal r1+r2. 2. The resistance is the same because the cross sectional area would get smaller even though the length increased Analysis In this lab we explored the concepts of current, voltage, resistance and resistivity. We did this by experimenting with resistors in a circuit and measuring each concept. Resistance of a rheostat was measured then resistivity was measured in order to determine what substance the rheostat was made of. Resistors were also placed in series one with a known resistance and the other with an unknown.
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Unformatted text preview: The total resistance was measured and the known resistance was subtracted from this value to determine the resistance of the unknown resistor. The same was done for resistors in parallel but a different formula was used to solve for the unknown resistor. Resistance for resistors in parallel is (1/r1+1/r2)^-1=resistance and this formula was used to solve for the unknown resistor. The dependence of resistance on temperature was observed when we heated a copper wire and plotted resistance versus temperature over 25 minutes. The trend we observed was that as temperature increases resistance of a material increases. Finally we measure the temperature of a bulbs filament....
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