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Unformatted text preview: Tam, Wilson Chi Hang (G00621273) ENGR 261 Spring 08 ’ 11/Feb/2008 Experiment #1 – Voltage and Current Dividers Introduction: This experiment provides experiences in measuring resistances, voltages, and currents in DC circuits. It also provides essential practice on using Multisim program to analyze DC circuits, and circuit analysis using voltage and current dividers. Theory: We will do both ideal theoretical value (by calculating the voltages, currents, resistances, and solving circuit schemes by hand method) and measured value (by setting up the circuit onto the circuit board and measuring each voltages, currents, and resistances with a digital multimeter) and to see they are closely matched or not. Procedures: 1.) Measure element values: a.) Measure and record the actual resistance of each resistor b.) Label the two 10k Ω resistors with their values, so easier to keep track of c.) Set the voltage of the DC power supply to ? = 5 Fig 1 2.) Prepare a data table: a.) create a table for recording your data. b.) enter data collected into the appropriate cells 3.) Collect voltage divider data: a.) construct Fig 1 on a breadboard. b.) start by making bus lines for power and bus connections. c.) turn on the DC power supply and measure voltages V 1 , V 2 , and V 3. d.) record these values in the data table. e.) does 1 + 2 + 3 = ? for both the computed measured values and explain. Tam, Wilson Chi Hang (G00621273) ENGR 261 Spring 08 ’ 11/Feb/2008 4.) Examine the current divider. Use the same resistor values as in the voltage divider of Fig 1. Fig 2. 5.) Create another table and record data. a.) use the ammeter to measure i 1 , i 2 , and i 3. b.) always turn of f the power before making changes in the circuit. c.) such as moving the ammeter to measure current through a different resistor. 6.) Design your own voltage/current divider (see Fig 3). a.) to design a circuit that will deliver 1.5 ± 5% across your particular load. b.) resistors available for use in design are 1 ?Ω , 8.2 ?Ω , 10 ?Ω , 15 ?Ω , 18 ?Ω , ¡?¢ 27 ?Ω . c.) the design must cost less than $0.75 and each resistor cost $0.14. d.) design and document a circuit that will meet the requirements. e.) construct the circuit and have instructor to sign off the sheet. Fig 3 Tam, Wilson Chi Hang (G00621273) ENGR 261 Spring 08 ’ 11/Feb/2008 Results: For Fig 1: Fig 1 We first solve for ? throughout the entire circuit so we can determine V 1 , V 2 , and V 3 By KCL: 5 = 10 ?? + 27 ?? + 10 ?? → 5 = 47 ?? → ? = 0.1 ? By Ohm ’ s Law: 1 = ? 1 = 0.10 ?¡ 10 ?Ω¡ = 1.00 1 = ? 2 = 0.10 ?¡ 27 ?Ω¡ = 2.70 1 = ? 3 = 0.10 ?¡ 10 ?Ω¡ = 1.00 Table for Fig 1 (both calculated and measured values) Component or variable number Nominal R value Nominal Voltage Actual Measured Ω Actual Measured V Voltage % Error R 1 , V 1 10 ?Ω 1.00 V 9.80 ?Ω 1.07 V 6.54 % R 2 , V 2 27 ?Ω 2.70 V 26.3 26....
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This note was uploaded on 10/12/2008 for the course ENGR 215 taught by Professor Enriquez during the Spring '08 term at San Mateo Colleges.
 Spring '08
 Enriquez
 Volt

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