Series Resistors


This circuit produces an output current, Io, that is proportional to the input voltage, Vs. The output current is measured using a ammeter. The input voltage is the voltage of the voltage source. The constant of proportionality is equivalent resistance of the series resistors. The value of the equivalent resistance is determined by the resistances, R1 and R2, of the two resistors that comprise the series resistors.


The values of the input, Vs, and of the resistances, R1 and R2, can be adjusted using the scroll bars.



Challenges:

  1. Set R1 = 20 and R2 = 40. Predict the value of Vs required to cause Io = 0.75. Use the scrollbars to check your prediction.

  2. Set R1 = 20 and R2 = 40. Determine the range of output current that can be obtained by adjusting the input voltage.

  3. Set R1 = 17 and Vs = 40. Predict the value of R2 required to cause Io = 1.6. Use the scrollbars to check your prediction.

  4. Set R1 = 20 and Vs = 40. Determine the range of output current that can be obtained by adjusting the resistance R2.

  5. Set R1 = 20 and Vs = 40. Determine the range of equivalent resistance that can be obtained by adjusting the resistance R2.

  6. Set Vs = 24. Adjust R1 and R2 so that Io = 0.5.

  7. Set Vs = 40 and R1 = 33. Adjust R2 so that the equivalent resistance is 85.

  8. Set Vs = 40 and R2 = 25. Adjust R1 so that the equivalent resistance is 85.

  9. Set Vs = 40. Adjust R1 and R2 so that R2 = R1 and the equivalent resistance is 85.

  10. Set Vs = 40. Adjust R1 and R2 so that R2 = 4*R1 and the equivalent resistance is 85.

  11. Set Vs = 40. Adjust R1 and R2 so that R1 = 4*R2 and the equivalent resistance is 85.

  12. Adjust R1 and R2 so that the value of the equivalent resistance is 67.

  13. Set R1 = 20. Determine the smallest value of equivalent resistance that can be obtained when R2 > R1.

  14. Determine the range of equivalent resistance that can be obtained by adjusting R1 and R2.