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DET103 ELECTRIC CIRCUIT FUNDAMENTAL 1 EXPERIMENT 2 OHM’S LAW OBJECTIVES 1. To learn the relationship among R, V and I. 2. To experimentally prove the mathematical relationship among R, V and I. INTRODUCTION Ohm’s law defines that voltage is proportional to the current and vice versa. The circuit current is inversely proportional to the resistance R. Both current and voltage have a linear relationship with resistance remain constant. The three forms of Ohm’s Law are, V IR , I V V , and R R I EQUIPMENT AND PARTS Digital Multimeter DC Power Supply Resistor : 1k-2 unit PROCEDURE 1. Measure the resistance of the 1kΩ resistor. Record this value in Table 1. 2. Connect the circuit shown in Figure 1. Figure 1 3. Adjust the power supply for a 10 V output as measured by the digital multimeter. Record this value in Table 1. 4. Measure the circuit current and record it in Table 1. 5. Using the measure values for V, R and I calculate V, R and I by using Ohm’s Law. Record the calculated values in Table 1. KOLEJ UNIVERSITI KEJURUTERAAN UTARA MALAYSIA 1 DET103 ELECTRIC CIRCUIT FUNDAMENTAL 1 6. Repeat steps 1 through 5 with the power supply set to 20 V. Record all measurements and calculations in Table 2. 7. Repeat steps 1 through 5 for the circuit of Figure 2. Record all measurements and calculations in Table 3. When you are measuring V, measure across both resistors. Figure 2 RESULTS V Measured values R I Calculated Values I=V/R V=IxR R=V/I Calculated Values I=V/R V=IxR R=V/I Calculated Values I=V/R V=IxR R=V/I Table 1 V Measured values R I Table 2 V Measured values R I Table 3 KOLEJ UNIVERSITI KEJURUTERAAN UTARA MALAYSIA 2 DET103 ELECTRIC CIRCUIT FUNDAMENTAL 1 EVALUATION QUESTIONS 1. How do the measured and calculated values compare?. ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ 2. Is the voltage across a resistor directly or indirectly proportional to the current through it?. ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ 3. In step 6 the voltage was increase from 10 to 20 V. The resistance remained unchanged. Did the results of your measurements and calculations for this step confirm Ohm’s law? Explain. ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ 4. In step 7, two resistors were used. Did your calculation of RT equal the sum of the two resistors? ________________________________________________________________________ ________________________________________________________________________ 5. Explain Ohm’s law in your own words. ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ 6. A 9V battery is used to supply voltage to a resistive circuit. Calculate the resistance value if the current flows through the resistor is 5mA KOLEJ UNIVERSITI KEJURUTERAAN UTARA MALAYSIA 3