EECE 310L Lab Report, Fall 2003

Experiment 3: Voltage Dividers and Thevénin's Theorem Experiment 3: Voltage Dividers and Thevénin's Theorem In-Lab Report A. Voltage divider circuits Build the circuit and then record the measured values in the Table below, the bleeder current I 1, the voltages VBand VA, and the load resistance RL for each of the load conditions in part A. Measured Values V(V) IL (mA) I1 (mA) VB (V) VA (V) RL (Ω) 10 0 10 2 10 4 10 6 B. Voltage Divider Design Connect the circuit. Measure the required voltages and currents and record them in a table. Measured Values VL(V) IL(mA) Ibleader(mA) C. Thevénin's Theorem • Connect the circuit of Fig. C.3 and measure the open-circuit voltage between points A and B of this circuit. Measured Value VTH(V) • With the 15 V source in Fig. C.3 replaced by a short -circuit, measure the resistance between the AB terminals with the digital multimeter. PDF processed with CutePDF evaluation edition www.CutePDF.com PDF processed with CutePDF evaluation edition www.CutePDF.com PDF processed with CutePDF evaluation edition www.CutePDF.com Print Form 2.764 6.684 3.337 inf 2.095 5.067 2.5283 2500 1.44 3.49 1.75 875 0.626 1.52 0.76 234 4.4 2.84 1.98 5.485 Experiment 3: Voltage Dividers and Thevénin's Theorem Measured Value RTH(Ω) • Connect the load resistances of 1 K Ω and 4.7 KΩ in turn in the circuit of Fig.C.3 and measure the corresponding load voltages. Measured Values Vload(V) 1 KΩ 4.7 KΩ • Find RTH using the matched-load method; that is, use a 5 KΩ potentiometer as a variable resistance between the AB terminals of the circuit of Fig. C.3. Vary the resistance until load voltage drops to half of the measured VTH (open-circuit voltage.) Then disconnect the load resistance and measure its resistance with the multimeter. Measured Value RTH(Ω) 2380 1.626 3.64 2377