Kayley Kilcoyne Physics 132Guy RosinMVAbstract: This experiment looks at Ohm’s law. By changing the amounts of resistors we can see how the currents and voltage change. When the voltage gets higher the current value also increases. We measured the different values of resistors in a parallel and series to see how the voltage and resistance changed. Questions:1. The equation for OHM’s law is R=V/L. In this equations the variable V stands for the voltage, the R variable stands for the resistance and the I variable stands for the amount of current that is flowing through the circuit to the resistor.2. By looking at the graph we can see that the data point fall in a line rather thana curve. For this part of the experiment we did not have the current reader on. So we must use the equation R= V/I to determine the current change do to varied sliding position. The current must increase if r is held constant and v increases. Current and voltage both increase at the same time because theyare directly proportional to each other.2 4 6 8 10 12 14 16 1800.511.522.53Position vs Voltage Linear ()Position (cm)Voltage (V)3. The slope of this graph is .33 ohms which measures the resistance of the resistor itself. Yes my value for r falls within the manufacturers expectations.0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.0900.511.522.53Voltage vs CurrentVoltage (V)Current (A)4. The colors codes for the resistors measures to be R1=10 ohms and R2= 36 ohms. The total resistance in the resistor series was Rseries=R1+R2. The R1 is 36 and the R2 is 10. The total resistance in series is 46.5. The totalresistance in parallel can be found by 1/Rparrallel=1/R1+1/R2. This means that the total resistance in series is 7.82 ohms. 5. The total voltage of r series in my data was 48.3 ohms and the resistor in parallel was 9.96. These values are very close to the measured values but the percent difference is about 3.79% difference from the measured data. I found this by using the equation (v1-v2)/v1+v2)*1006. According to my data carbon resistors are Ohmic devices. In order for a resistor to be an Ohmic device it must follow Ohms law. When looking at the previous graphs we can se that voltage and current both increase proportionally with each other which means that they follow ohms law, meaning that it is an Ohmic device.7. The resistance of this light bulb shows that this is not really an ideal resistor because the line has a little bit of a curve to it which means that the as the voltage and current increase the resistance isn’t staying current it is slightlygetting smaller, showing that it is not an ideal resistor.0 0.5 1 1.5 2 2.5 3 3.505101520253035VoltageCurrent8. The lights work instantaneously because there are many electrons flowing in at the same time so they keep the light on instantaneously. It doesn’t matter ifthe net sped is low because there are so many electrons that only have to travel a short distance so they keep the light on instantaneously. Conclusion:When looking at the first graph of the voltage vs. position the points are not in a completely straight line, this can be cause by human error when measuring thepositions with a ruler. By looking at the data we have proved that ohms law is accurate by looking at the proportionality between the voltage and current and how they are
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