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Physis 102 Ohm’s Law Lab Report Manju Sogi & Alma Fuentes Abstract This experiment will verify Ohm’s Law through the use of circuits in parallel and in series. Equipment Digital voltmeter Digital ammeter Resistors (decade boxes) Variable D.C. power supply Wires Procedure 1. Choose three resistors and label them R1, R2, R3. 2. Choose a resistance that is in the same order of magnitude across each resistor and is greater than 20 ohms. 3. Set the power supply to 6V. 4. Construct a circuit in series and measure the current and voltage across each resistor, record observations. 5. Construct a second circuit in parallel and measure the current and voltage across each resistor, and the positive side of the power supply and R1, record observations. 6. Construct a third circuit having R1 in series and R2 and R3 in parallel. Measure voltages and currents. Data Insert a table for data here Analysis Series R1 R2 R3 Circuit 1 Ohms 20 40 60 V1 V2 V3 Volts 1.502 1.997 2.974 I1 I2 I3 Amps 0.05 0.05 0.05 theoretical 0.0526 0.0499 0.0495 Slope 0.0368 Itotal Parallel Ohms 20 40 60 Circuit 2 Volts 6 6 6 Slope 6.345622 Theroetical Amps 0.27 0.15 0.1 3.703704 6.666667 10 Amps 0.3 0.15 0.1 0.49 I Total 0.3 Circuit 3 R1 R2 R3 Ohms 20 40 60 I1 I2 I3 Amps 0.12 0.07 0.05 V1 V2 V3 Volts 2.87 3.07 3.09 Slope 0.0055 0.144 0.076 0.0515 Questions 1. What can you say about the sum of the voltage drops in Circuit 1? The voltage across each resistor changes. 2. What can you say about the sum of the current through the resistor in circuit 2? The current across each resistor changes and the current stays the same. 3. Construct a graph for each circuit plotting every V(I) point. Look for obvious linear relationships and calculate the slopes of these lines. 4. Construct a table, subdivided into three parts, where every experimental value (what you measured) is compared with its theoretical value (what you calculated with Ohm’s Law). Conclusion In conclusion, we found that our data didn’t exactly match as our hypothesized answers but nonetheless our data did come close to our theoretical answers. We learned from this lab that the voltage in a series circuit across each resistor changes but the current stays the same. However, in a parallel circuit, the current changes in each resistor and the voltage stays the same. Your graphs need a better scale. Also you need to draw the best fit line and find the slope Grade 70/100