Question.4774 - Pre-Lab QuestionsAccording to Ohm’s Law, if you have a simple circuit (Figure 3), what happens to the voltage and current of the resistor as the resistance increases? Figure 3: A simple circuit.If a 100 Ω resistor is attached to a 5 V battery, how much current flows through the resistor?If a wire’s length is cut in half, what happens to the wire’s resistance?If a wire’s area is reduced by half, what happens to the wire’s resistance?If the diameter and length of a wire are split in half, what happens to the resistivity, ρ?Experiment 1: ohm’s lawData SheetTable 2: Voltage Reading of Different AA Battery CombinationsBattery CombinationVoltage (V)1 1 and 2 1, 2 and 3 1, 2, 3 and 4 Table 3: Resistor DataResistance (Ω)Slope (V/A)Percent DifferencePost-Lab QuestionsPlot a graph of Table 2. Construct your plot on a computer program such as Microsoft Excel ®.What is the relationship between voltage and current? Use data from your graph to support your answer.Estimate the slope of the linear line and record it in Table 3.How does the value of the slope compare to the resistance you measured? Calculate the percent difference.Use the results of your experiment to verify Ohm’s Law.How does adding more batteries affect the power dissipated through the resistor? Support your answer mathematically and record your answer in variable form.Experiment 2: Resistance of play-doh ®Data SheetTable 4: Cylinder Length Circuit DataBattery Voltage (V)Cylinder Radius (m)Table 5: Length and Resistance of Circuit DataLength (m)Current (A)Resistance (Ω)Table 6: Cylinder Area Circuit DataBattery Voltage (V)Cylinder Length (m)Table 7: Resistance and Area Circuit DataDiameter (m)Area (m2)Current (A)Resistance (Ω)Post-Lab QuestionsCalculate the area for each diameter tested. Record area values in Table 7.Find the resistance in each case of the Play-Doh ® using Ohm’s Law, and finish completing Tables 5 and 7.Make a plot of Resistance, R, versus Length, L, and Resistance versus Area, A. Construct your plot on a computer program such as Microsoft Excel ®.What is the relationship between resistance, R, and length, L?What is the relationship between resistance, R, and area, A?Determine the resistivity of the Play-Doh ® from the slope of the graph.Does the resistivity of Play-Doh ® change when the length or area is changes? Explain your reasoning.Hint: A percent difference calculation will be helpful.Calculate the current density, J, for all Play-Doh ® radii in Table 6. What trend do you observe?
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