Experiment 5 - ECE103. Spring 08 Experiment #5 Student(s)...

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Unformatted text preview: ECE103. Spring 08 Experiment #5 Student(s) name: [Type text] Experiment #5 Series and Parallel Resistor Circuits Objective: In this lab you will measure the voltages and currents in circuits with multiple resistors in series or parallel combinations. You will learn how to use these types of resistor combinations to build voltage and current divider circuits. * Equipment list : 1. Protoboard, wires 2. Current and Voltage Sources (power supply) 3. Multimeter 4. Resistors 82 Ω , 150 Ω , 4.7k Ω ,10k Ω , (I). Resistors in series (30 points) Procedure: 1.) Construct the circuit shown in Figure (1) on the next page. Use the 25V maximum section of the power supply. 2.) Disconnect the power supply and then measure the total resistance of the series resistor combination using the multimeter as an ohmmeter. Enter the measured value for the equivalent resistance, Req, of the combined resistors in the following table across from the appropriate values of R 1 and R 2 . 3.) Reconnect the power supply with Vs = 5V, and measure the voltage V 1 across resistor R 1 and the voltage V 2 across R 2 . Enter these values in the table across from the appropriate values of R 1 and R 2 . R1( Ω ) R2( Ω ) Measured Req ( Ω ) V 1 (V) V 2 (V) V 1 + V 2 (V) I1 (mA) I2 (mA) Caclulated Req ( Ω ) 150 82 82 82 4.7k 4.7k 10k 4.7k ECE103. Spring 08 Experiment #5 Student(s) name: [Type text] 4.) Using the values for R 1 and V 1 calculate the value of the current, I 1 , flowing through resistor R 1 . Repeat this calculation for the current, I 2 , flowing through resistor R 2 using the values for R 1 and V 1 . Enter the currents in the appropriate boxes in the table. 5.) Calculate the total voltage drop across the resistors and enter it in the table in the column for V 1 + V 2 . The equivalent resistance of the series resistor combination is the value of a single resistor that could replace the two resistors and result in the same total voltage and current. The equivalent resistor value can be calculated simply from Ohm’s law as Req = (V 1 + V 2 )/I where I= I 1 or I 2 . Enter the calculated equivalent resistance in the final column of the table. 6.) Answer the following questions: a) Is the voltage the same across each resistor? Which one is larger? Explain why. ........................................................................................................................... ........................................................................................................................... ........................................................................................................................... ..............................................................................................................................
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This note was uploaded on 10/28/2008 for the course ECE 103 taught by Professor Marconi during the Spring '08 term at Colorado State.

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Experiment 5 - ECE103. Spring 08 Experiment #5 Student(s)...

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