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Electricity and Magnetism

Investigation 1 – PostLab

 

 

 

 

 

 

 

ANALYZE IT

  • Complete the Analysis Questions in your SDR then discuss them as a class. 

  • Create a best fit line graph showing the effect of changing voltage on current in the circuit with Resistor A. Use the data from Table A to create the graph. 
    • Note: If necessary, students should refer to the procedures for Determination and Graphing of Independent and Dependent Variables and Drawing of a Best Fit Line.

     

    • Analyze your graphs by answering the question:
    • Look at the graph above. How would you describe the relationship between voltage and current for Resistor A? 

     

     

                  • Create a graph showing the effect of changing voltage on current in the circuit with Resistor B. Using the data from Table B to create the graph. Refer to the procedures for Determination and Graphing of Independent and Dependent Variables and Drawing of a Best Fit Line if necessary.

               

              • Look at the graph above. How would you describe the relationship between voltage and current for Resistor B? 

              • Compare the two graphs. Do both show the same relationship between voltage and current? Are there any differences between the two graphs? Explain your answer. 
              • Use Ohm’s law to calculate the amount of resistance supplied by Resistor A.
              • Convert milliamps as shown before making your calculations. Record your answers in Table A.
              • Use the formula for Ohm’s Law below to calculate resistance.

              • What happened to resistance as the number of batteries and voltage of the circuit increased? Did the resistance increase, decrease, or remain constant? Resistance remained constant.
              • Use Ohm’s law to calculate the amount of resistance supplied by Resistor B. Convert milliamps to amps as shown before making your calculations. Record your answer in Table A.
              • Use the formula for Ohm’s Law again to calculate resistance.

              • In both circuits as the voltage increased, the current increased. What happened to resistance in both circuits as the voltage and current increased? 
              • Ohm’s law states that the voltage through a conductor is proportional to the current through it (V= IR). Did the circuits with the two different resistors both follow Ohm’s law? 

               

               

              GET FOCUSED

              Complete the Focus Question in your SDR then discuss it as a class. 

              • What is the relationship between voltage, current, and resistance? Use your results to explain your answer.