Lab1 Worksheet /

I. Resistance Variations(20 pts total)

  1. 2.2K resistors:
  1. Attach to this worksheet a table providing your measured resistances (3 pts)
  1. Provide below the mean and median values, and the standard deviation of your resistance values. (2 pts)
  1. Provide below the mean, median, and standard deviation as percentages of the nominal resistance. (2 pts)
  1. Are the estimated variations within the manufacturer’s tolerances? Explain. (3 pts)
  1. 47K resistors:
  1. Attach to this worksheet a table providing your measured resistances (3 pts)
  1. Provide below the mean and median values, and the standard deviation of your resistance values. (2 pts)
  1. Provide below the mean, median, and standard deviation as percentages of the nominal resistance. (2 pts)
  1. Are the estimated variations within the manufacturer’s tolerances? Explain. (3 pts)

II. Resistance from measured current-voltage data(20 pts total)

  1. Circuit diagram; measured resistance value of resistor. (5 pts)
  1. Attach a table to this worksheet, providing your measured vR and iR over range of vs from 0V – 2V (minimum 10 data points) (10 pts)

3.DEMO: Have a teaching assistant initial this sheet, indicating that they have observed your circuit’s operation. (5 pts)

III. Nonlinear Resistance(20 pts total)

  1. Attach a table to this worksheet, providing:
  2. your measuredvR and iR over range of vs from 2V – 7V. (5 pts)
  3. Resistance for each pair of vR and iR.
  1. In the space below, discuss consistency of data; percent difference in range of resistance over given voltage range. (4 pts)
  1. In the space below, provide the measured resistance value after resistor cooled (from voltage-current data and ohmmeter). Determine percent change in resistance, discuss change in resistance from nominal value. (5 pts)

3.DEMO: Have a teaching assistant initial this sheet, indicating that they have observed your circuit’s operation. (6 pts)

IV. Dusk-to-dawn light(20 pts total)

  1. Provide below the calculated values of VB for photocell resistances of 5K and 20K. (5 pts)
  1. Provide below measured values of VB for photocell resistances of 5K and 20K and comparison with calculated values. (8 pts)
  1. DEMO: Have a teaching assistant initial this sheet, indicating that they have observed your circuit’s operation. (7 pts)

V. Post-Lab Exercises(20 pts total)

  1. Provide below an equation for least-squares best fit line to the data and the correlation coefficient between the data and the curve fit. Attach to this worksheet a plot of data vs. best fit line. (8 pts)
  1. Attach to this worksheet a plot of vR vs. iR over range of vs from 0V – 7V. Comment on linearity of results. (7 pts)
  1. Attach to this worksheet a table containing power dissipation over range of vs from 0V – 7V. In the space below, provide the power level when nonlinear effects first noted. (5 pts)

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