Lab #2

Three Random Resistors

1.

Color codes: Orange, Orange, Brown, Gold

Stated resistance value: 330 ohms

Tolerance: 5%

Min/max possible resistance:  313.5-346.5 ohms

Actual measured resistance: 334 ohms

2.

Color codes : Orange, Orange, Yellow, Gold

Stated resistance value: 330,000 ohms

Tolerance: 5%

Min/max possible resistance: 313,500-346,500 ohms

Actual measured resistance: 321,400 ohms

3.

Color codes: Red, Red, Red, Gold

Stated resistance value: 2,200 ohms

Tolerance: 5%

Min/max possible resistance: 2,090-2310 ohms

Actual measured resistance: 2,150 ohms

Resistors in Series

1.

Stated Value: 10k ohms

Measured Value: 9,760 ohms

2.

Stated Value: 22k ohms

Measured Value: 21,710

3.

Stated Value: 47k ohms

Measured Value: 45,690

Calculations: R = 9,760 + 21,710 + 45,690 = 77,160 ohms

Calculated Total Value: 77,160 ohms

Measured Total Value: 77,150 ohms

Resistors in Parallel

1.

Stated Value: 10k ohms

Measured Value: 9,760 ohms

2.

Stated Value: 22k ohms

Measured Value: 21,710

3.

Stated Value: 47k ohms

Measured Value: 45,690

Calculations: 1/((1/9760)+(1/21710)+(1/45690)) = R = 5,868.29 ohms

Calculated Total Value: 5,868.29 ohms

Measured Total Value: 5,850 ohms

Voltage Dividers

Calculations: Vout = 8.9V * 9,760ohms/31,470ohms = 2.78 V

Calculated Value of Vout: 2.78 Volts

Measured Value of Vout: 2.8 ohms

6 resistors

1.

Stated Value: 47k ohms

Measured Value: 45,700 ohms

2.

Stated Value: 22k ohms

Measured Value: 21,710

3.

Stated Value: 10k ohms

Measured Value: 9,760 ohms

4. 

Stated Value: 22k ohms

Measured Value: 21,500 ohms

5.

Stated Value: 22k ohms

Measured Value: 21,800 ohms

6.

Stated Value: 47k ohms

Measured Value: 46,700 ohms

Calculations: R1 = 1/((1/47k)+(1/22k)) = 14,985.51 ohms

R2 = 22k + 10k = 32,000 ohms

R3 = 1/((1/47k)+(1/22k)) = 14,985.51 ohms

R1 + R2 + R3 = 61,971.02 ohms

Calculated Value: 61,971.02 ohms

Measured Value: 60,840.29 ohms

Voltage Dividers 2

Vin

Stated Value: 9 Volts

Measured Value: 8.9 Volts

Calculations: Vout1 = 9 * (46,985.51/61,971.02) = 6.8 Volts

Vout2 = 9 * (36,985.51/61,971.02) = 5.4

Vout1 Calculated Value: 6.8 Volts

Vout1 Measured Value = 6.75 Volts

Vout2 Calculated Value: 5.4 Volts

Vout2 Measured Value: 5.32 Volts

Voltage 1 to 3

Vin

Stated Value: 9 Volts

Measured Value: 8.9 Volts 

R1

Stated Value: 10k ohms

Measured Value: 9,760 ohms

R2

Stated Value: 22k ohms

Measured Value: 21,500 ohms

R3

Stated Value: 47k ohms

Measured Value: 46,700 ohms

Calculations:

V1 = 9 * (9760/77960) = 1.13V

V2 = 9 * (21500/77960) = 2.48V

V3 = 9 * (46700/77960) = 5. 39

Measured Values:

V1 = 1.1V

V2 = 2.5V

V3 = 5.3V

Trouble Shooting

• I had difficulty seeing the colors on the resistors
• I had trouble with understanding the different range sets on the multi meter
• When measuring the values of the resistors, some resistors were touching, which made my first measurements incorrect