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Exercise #4 Voltage Divider A. Introduction In a previous exercise, you learned about the current-voltage relationship in a single resistor. Now, you will about how voltage is divided across two resistors in series. In this exercise you will: Examine the operation of the electric circuit known as the voltape divicder At the conclusion of this exercise you should be able to Compute the valtage across a resistor in a voltage divider circuit Design a voltage divider circuit to produce a specified voltage B. Parts List The following material is required to complete this exercise. Description Ref Des n/a Note(s) Qty NI LLVIS I/11 For this exercise, any variable DC power supply and multimeter capable of measuring resistance may be used RESISTOR, 2.2k OHM RESISTOR, 3.3k OHM 2 1. R4 1 RESISTOR, 4.7k OHM R2 D. Procedure 1) For Circuit A of Figure S-1, calculate the voltage across resistor R2 using the lormula tor voltage divisio Ernter thee valu on the dats sheel Hor Circuit of Higure 5-2, compute the equivalent resistance of H2 & K3 and recalculate the voltage at the same point in the circuit. Enter the valua on the data shent. 3) 2) For Circuit Cof Figure 5-3, compute the equivalent resistance of R2-R4 and recalculate the voltage at the same point in the circuit. Cnter the value on the data sheet RI RI R.I Mer us R3 Circuit B Cirevit c Cireuit A 4) startup Test Equipment Attach the NI FI VIS II to vour computer using a USB cable Turnon th NI FIVIS II sing the switch on the rear of its base Start the NI ELVISMX Instrument Launcher Activate the following measuring Instruments i. DMM (Digital Multimeter) ii. VPS (Varisble Power Supply 0-12 V DC) S) Use your multimeter to verify that you are using the correct resistor values G) Build Circuit A on the ELVIS prototyping board 7 Set your variable power supply voltage to 12 +/-0.1 V. R) Use your DMM to verify that your valtage is correct 9) Measure the voltage across R2 and enter the value in the datasheet 10) Build Circuit B 11) Repeat measurement and record data 12) Build Circuit C 13) Repeat measurement and record data E. Data Sheet TABLE 4-1: Valtage Aeross R2 Calculated Trial Measured Name Voltage (V voltage (V) Circuit A Circuit B Circuit C F. Reflection Questions 1) what would happen to the voltage at the output terminals if R1 and R2 were equal in value? 2) If you were asked to design a circuit that produced a 3V output from a 12V source, what would you do?