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Ohm's Law and Resistors in Series and in Parallel

Ohm's Law and Resistors in Series and in Parallel. Presented by Mahmud AbdurRahman & Nazim Uddin Physics 2.3 honor Class DR. Roman Kezerashvili. Objectives:. 1. Verify law by observing the dependence of the electric current as a function of voltage and as a function of resistance.

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Ohm's Law and Resistors in Series and in Parallel

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  1. Ohm's Law and Resistors in Series and in Parallel Presented by Mahmud AbdurRahman & Nazim Uddin Physics 2.3 honor Class DR. Roman Kezerashvili

  2. Objectives: 1. Verify law by observing the dependence of the electric current as a function of voltage and as a function of resistance. • 2. Determine the equivalent resistance of series and parallel combination of resistors and compare the results with the theoretical predictions. • 3. Study currents flow and voltages in series and parallel circuits.

  3. Equipment • 1 Resistance box • 2. Digital Multmeter • 3. DC power supply with adjustable voltage (0-20 V) • 4. Resistors board • 5. Connecting wires • 6. Switch

  4. TheoryWhat is the Ohm’s Law • Ohm’s law States that current through a resistor is directly proportional to the applied voltage V and inversely proportional to the resistance R of the resistance • Ohm’s law is not a fundamental law of nature • An empirical relationship that is valid for certain material • at constant temperature Electric current I=Q/T Ohm’s Law I=V/R

  5. Procedure • Part1 • 1.Investigate the variation of the current with potential difference when the resistance is constant • 2. Investigate the variation of the current with resistance when the voltage is constant. • Part II • 1.Resistors in series • 2. Resistors in Parallel

  6. Ohm’s Law( The relationship among current,voltageand resistance)Resistors in SeriesResistors in Parallel Data: • Table 1. The Voltage Dependence of Current (Constant resistance) • Power supply , V R1= 1000  R2= 1200  • Voltage V, V Current I, A Voltage V,V • 4 4.02 0.0040 4.02 0.0033 • 5 5.02 0.0049 5.02 0.0041 • 6 6.02 0.0060 6.03 0.0049 • 7 7.02 0.0070 7.04 0.0058 • 8 8.01 0.0079 8.01 0.0066 • 9 9.01 0.0090 9.00 0.0074 10 10.03 0.0099 10.02 0.0082

  7. Data • Resistance R,  1/R, -1 Current I, A • 700 0.00143 0.01700 • 800 0.00125 0.01490 • 900 0.00111 0.01320 • 1000 0.00100 0.01190 • 1100 0.00091 0.01084 • 200 0.00083 0.00994 Voltage Power supply V,V=12 V from Slope,V 11.874 %Difference 1.06%

  8. Continuation • Table 3. Resistors in Series • I = 0.0024 A, V = 12 V, R = 4950  • Resistors Current I, A Voltage V, V Resistance R,  • RA 0.0024 8.74 3620 • RB 0.0024 2.63 1090 • RC 0.0024 0.57 230 Equivalent resistance from equation (9) R = 4940; % difference = 0.20% Total voltage from equation (5) V = 11.94V; % difference = 0.50% • Table 4. Resistors in Parallel • I = 0.032 A, V = 6 V, R = 185.6  • Resistors Current I, A Voltage V, V Resistance R,  • RA 0.0018 6 3620 • RB 0.0054 6 1090 • RC 0.026 6 230

  9. GRAPH

  10. Graph 2

  11. Calculation and Analysis: 1. Use data from Table 1 and plot a graph of the current I us the voltage V for both values of the resistance. Determine the slope of the graph. From the slope of the graph find the resistance using • R=1/slope • and compare it to the actual value of resistance by calculating a percent difference. • 2. Use data from Table 2 and plot a graph of the current I versus the 1/R. Determine the slope of the graph. Compare the slope of the graph with the output voltage of power supply by computing a percent difference. • 3. Resistors in series. • Using the resistors value compute the equivalent resistance R of the circuit by using equation (9). Compare this value with your experimental measurement by finding a percent difference. • Using the measured voltages compute the total voltage V by using equation (5). Compare this value with your experimental measurement by finding a percent difference.

  12. Continue Calculations

  13. Continue Calculations

  14. Conclusion • According to the experiment we observed that the electric current through a resistor is directly proportional to the applied voltage and inversely proportional to the resistance of the resistor and verified Ohm’s law. • We also observed the difference between series and parallel connections. I LOVE PHYSICS THANKS TO PROFESSOR DR. ROMAN FOR MAKING PHYSICS SO ENJOYABLE.

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