# Parallel Resistors

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

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

### Challenges:

1. Set R1 = 30 and R2 = 60. Predict the value of Is required to cause Vo = 200. Use the scrollbars to check your prediction.

2. Set R1 = 30 and R2 = 60. Determine the range of output voltage that can be obtained by adjusting the input current.

3. Set R1 = 20 and Is = 10. Predict the value of R2 required to cause Vo = 150. Use the scrollbars to check your prediction.

4. Set R1 = 20 and Is = 10. Determine the range of output voltage that can be obtained by adjusting the resistance R2.

5. Set Is = 8. Adjust R1 and R2 so that Vo = 240.

6. Set Is = 10 and R1 = 33. Adjust R2 so that the equivalent resistance is 16.5.

7. Set Is = 10 and R2 = 85. Adjust R1 so that the equivalent resistance is 27.2.

8. Set Is = 10. Adjust R1 and R2 so that R2 = R1 and the equivalent resistance is 42.

9. Set Is = 10. Adjust R1 and R2 so that R2 = 2*R1 and the equivalent resistance is 42.

10. Set Is = 10. Adjust R1 and R2 so that R1 = 2*R2 and the equivalent resistance is 42.

11. Adjust R1 and R2 so that the value of the equivalent resistance is 35.

12. Set R1 = 50. Determine the largest value of equivalent resistance that can be obtained when R2 < R1.

13. Set R1 = 50. Determine the largest value of equivalent resistance that can be obtained when R1 < R2.

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