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Objective The purpose of this lab is for students to investigate the relationship between the three variables involved in Ohms Law- Current Voltage and Resistance Theory The Ohms law states that the direct current flowing in a conductor is directly proportional to the potential difference between its ends It is usually formulated as V IR where V is the potential difference or voltage I is the current and R is the resistance of the conductor Formulas VIR Materials 1 Circuits Experiment Board 2 D-Cell 3 Wire 4 Digital Multimeter DMM 5 Resistors Diagrams Ammmeter Umm Wire Volt Meter rheostat Procedure 1 Making sure that the switch is open carefully construct the circuit When connecting the current meter 50ma Full-Scale meter in series with the resistor R make sure that the terminal and the - terminal are connected properly Otherwise the pointer of the current meter will deflect in the wrong direction when current passes through the circuit and this could very well damage the meter itself 2 Connect points A and B of the circuit to the red and black terminals 0-12 VDC of the power supply Make sure that the rotating knob of the power supply is turned down to zero fully clockwise Adjust the decade resistance box to 100 ohms 3 By carefully turning the power supply clockwise with the switch closed measure the voltage across the resistor R when the current is adjusted from 5ma to 50ma in increments of 5ma B Variation of currents with resistance keeping Vr constant 1 Repeat steps 1 and 2 of part A above 2 For each value of R in table II very carefully adjust the knob of the power supply until the voltage across the resistor R is 10 VDC and measure the current for each of these values
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