Ohm S Law Lab s1

Electromechanical Technology Name(s): ______Basic Electronics Section: ______Series Circuits (30 pts.) Due Date: ______

Materials Required: 7. For this section of the experiment, you will DMM use the following resistors: Power Supply

Breadboard R1 150

Misc. wires R2 15

Resistors: 10, 15, 100, 150, 220, 330, R3 10 390, 470, 560, 1.2k, 2.2k, 3.3k, 4.7k 8. Using an ohmmeter, measure each resistor value for the resistors required for this Procedure: section. Connect the resistors in series, and measure the total resistance RT. Record the Section 1: Series Resistance results in Table 2.

1. For this section of the experiment, you will 9. Using the information from the class and be using the following resistors: from your textbook, and from Figure 2, calculate the total resistance, the series

R1 330 current, and the individual voltage drops

R2 470 across R1, R2, and R3. Record the results in

R3 1.2k Table 3. Show all your work for these

R4 2.2k calculations.

R5 3.3k 10. Connect the circuit of Figure 2 and turn the R6 4.7k DC power supply on. Using a voltmeter, 2. Measure the resistance value of all resistors. adjust the power supply level to 10 V dc. Record the value of each resistor in Table 1. Fill in all empty cells in the column below 11. Measure the voltage drops across each the resistor number resistor as indicated in Figure 2. For example, the voltmeter is shown connected 3. Connect the series arrangement 1 shown in across R1 to measure VR1. Record the results in Table 3. Figure 1 by connecting resistors R1 and R4 in series. 12. After recording the measured voltage drops, 4. Using the measured values of the individual compare the measured and calculated values. Use the following formula for resistors in the circuit, compute RT. Record this value in Table 1. To measure total determining this percentage: resistance, it is necessary to measure across the entire circuit – from point A to point B. difference between meas. and calc. values %  X100 5. Remove one of the resistors (do not calc. values

reconnect the circuit) while measuring RT, 13. If any error is greater than 10%, ask your and record the results of your measurement instructor for further directions. in Table 1. 14. Measure the current at points A, B, C, and D 6. Complete steps 3 – 5 for resistor in Figure 2. Record this information in combinations 2 and 3 in Figure 1. Table 4.

Section 2: Series Voltage and Current. Note: To measure current, you must actually open the circuit at these points and insert your

1 ammeter between the two component leads (wires) as shown if Figure 2.

2 Table 1 Measured Resistor Measured Resistance () Calculated Measured RT with a Combination RT RT resistor R1 R2 R3 R4 R5 R6 removed 1 2 3

A B 330 Ω 2200 Ω Combination 1

R1 R3 R4 R6 A B 330 Ω 1200 Ω 2200 Ω 4700 Ω

Combination 2

R1 R2 R3 R4 R5 R6 A B 330 Ω 470 Ω 1200 Ω 2200 Ω 3300 Ω 4700 Ω

Combination 3

Table 2 Table 3 Nominal Measured Calculated Measured % Error Resistance () Resistance,  RT

R1 = 150 IT

R2 = 15 VR1

R3 = 10 VR2

RT = 175 VR3

Table 4 Point Current, mA A + - A B A + C R 1 V 150 D - Figure 1 B

VT R2 10 V 15

R3 10 3

D Figure 2