TTEC 4824-Automotive Electronics

Experiment No. 1

Identifying, Testing and Troubleshooting Semiconductor Components.

6 resistors were given to me with the aim to determine there values two ways:

• Using the colour code chart (as shown)
• Using an ohmmeter across the resistors
• Also the max and min tolerances were asked for

Resistor 1:

• Measured value = 986Ω
• Calculated value = Brown (1), Black (0), Red (2), Gold (5%) =1KΩ
• Tolerance Level = (950-1050)Ω

Resistor 2:

• Measured Value = 46700Ω
• Calculated Value = Yellow (4), Violet (7), Orange (3), Gold (5%) = 47000Ω
• Tolerance Level = (44650-49350)Ω

Resistor 3:

• Measured Value = 99.7Ω
• Calculated Value = Brown (1), Black (0), Brown (1), Gold (5%) = 100Ω
• Tolerance Level = (95-105)Ω

Resistor 4:

• Measured Value = 99.3Ω
• Calculated Value = Brown (1), Black (0), Brown (1), Gold (5%) = 100Ω
• Tolerance Level = (95-105)Ω

Resistor 5:

• Measured Value = 2170Ω
• Calculated Value = Red (2), Red (2), Red (2), Gold (5%) = 2200Ω
• Tolerance Level = (2090-2310)Ω

Resistor 6:

• Measured Value = 465Ω
• Calculated Value = Yellow (4), Violet (7), Brown (1), Gold (5%) = 470Ω
• Tolerance Level = (446.5-493.5)Ω

Choose Two Resistors and measure there values with an ohmmeter:

• Resistor 1 = 2170Ω
• Resistor 2 = 465Ω

I placed the resistors in series with each other then calculated and measured them for readings:

• Calculated resistance of resistors 1 and 2 in series = 2670Ω (Add them together)
  
• Measured resistance of resistors 1 and 2 in series = 2640Ω

I also placed the resistors in parallel with each other then calculated and measured them for readings:

• Calculated resistance of resistors 1 and 2 in parallel = 940Ω = (2200x470/2200+470)
  
• Measured resistance of resistors 1 and 2 in parallel = 383Ω

The Principles of electricity demonstrated here are that in series Rt (total resistance) is the sum of each resistive unit. (add them all together).
When in parallel Rt (total resistance) is less than any one branches resistance.
Rt = R1xR2/R1+R2 (Formula is for two resistors only).

or for three resistors:

Rt=R1xR2/R1+R2=R3

Rt=R2xR3/R2+R3