phy 112

Lab #4: Uhm's Law | 5 points] Purpose: To investigate the relationship among current, voltage and resistance. Procedure: Click on the link: https://phet.colorado.edu/simsfhtml/ohms-law/latest/ohms-law_en.html Follow the directions to complete the lab. Part A: Voltage is set at 4.5V and Resistance is set at 500 Q 0 Write the equation connecting I, R, and V. [ 1/2 point ] o How does the size of the current (I) compare to the size of the Voltage and Resistance? The current ow in circuit is directly proportional to the applied voltage. [ 1/2 POW I Part B: Data Collection: Constant Resistance, Changing Voltage o In the rst experiment, you will change the voltage to see the effect it has on the current. The resistance will stay the same (500 1). 0 Move the Voltage values to those listed in the Data Table I and record the current for each setting. Current is recorded in milliamps (mA). What happened to the size of the current (I) in the equation as the voltage increased? I The current increases. I [Hint: Increase/Decrease] [1/2 point] Leave Leave Data Table l: Constant Resistance (500 9), Data Table 2: Constant Voltage (3.0 V), value as value as 3 sig.fig. 2 sig. g. Changing Voltage [ '/1 point] Changing Resistance [ 1/: point] [1 point] [ 1 point] I * R (Volts) 3.0*10"3 2.9*10"'3 3.0*10"3 2.9*10"3 3.0*10"3 Current, 1(mA) 100 30 Voltage V, (V) Current, I (mA) Resistance, R (Q) 3/6: .500 _ 6fl2=.500 7.5/15=.50l 9f18:.500 Part C: Data Collection: Constant Voltage, Changing Resistance 0 In the second experiment, you will change the resistance to see the effect it has on the current. The Voltage will stay the same (3.0 V). 0 Move the Resistance values to those listed in Data Table 2 and record the current for each setting. Current is recorded in milliamps (mA). What happened to the size of the current (I) in the equation V = I R as the resistance increased