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# If the value of the total effective resistance

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Unformatted text preview: 1. Select four different resistors greater than 40 ohms and accurately measure their resistances with a digital multimeter (DMM). PHY 2141/2181 EXP # 4 2 2. Draw the two following schematic diagrams in your notebook. Circuit #1 Circuit #2 Figure 2 Schematic diagrams of the circuits used in Part I. 3. Calculate the total effective resistance (across points A and B) of both circuits. Determine the current through and the voltage across each of the four resistors expected with a 10 V batterie (or power supply). 4. Assemble the resistors to produce Circuit #1. But DO NOT CONNECT the power supply. 5. Measure the resistance of the assembled circuit using a DMM. Compare this value with the total effective resistance calculated in Step 3. If the value of the total effective resistance calculated in Step 3 differs by more than 10% different from the measured value, check the circuit, repeat your measurements, and verify your calculations for errors. 6. Calculate the total current that will Mlow through the circuit when the power supply is connected in. If the expected current is larger than 250 mA, check your circuit and calculations. 7. Ask the TA to verify and APPROVE your circuit. 8. Once you have received approval of the TA, connect the resistor network to the 10- volt power supply (use the wall power strip connections). 9. Measure the current that Mlows through the circuit (i.e. provided by the power supply) 10. Compare the measured value with the value you calculated in step 6. 11. If the two values (i.e. the prediction and the measured value) differ by more than a few percent, once again check the circuit to make sure the connections were properly made, and repeat the measurements. 12. Dismantle Circuit #1 and assemble the resistors to produce Circuit #2. Do NOT connect the power supply. Repeat steps 5 through 11 with Circuit #2. PHY 2141/2181 EXP # 4 3 6.2. PART II: The internal resistance of a battery 1. Select a resis...
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