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 university:courses:electronics:electronics-lab-0 [12 Apr 2017 13:11]amiclaus rename + minor description change for batteries university:courses:electronics:electronics-lab-0 [24 Jul 2017 15:01] (current)amiclaus change amplitude value to peak-peak Both sides previous revision Previous revision 24 Jul 2017 15:01 amiclaus change amplitude value to peak-peak12 Apr 2017 13:11 amiclaus rename + minor description change for batteries14 Dec 2012 21:45 dmercer [Extra Credit: Solar Cell] 26 Oct 2012 16:48 dmercer created 24 Jul 2017 15:01 amiclaus change amplitude value to peak-peak12 Apr 2017 13:11 amiclaus rename + minor description change for batteries14 Dec 2012 21:45 dmercer [Extra Credit: Solar Cell] 26 Oct 2012 16:48 dmercer created Line 9: Line 9: ​ Figure 1 Equivalent circuit for a real world voltage source (battery).​ Figure 1 Equivalent circuit for a real world voltage source (battery).​ - For this circuit you should have one or more batteries ( AA or AAA ) and a holder for them. Insert the batteries in the holder and add an external 100Ω resistance in series with the batteries as shown in figure 2. The green boxes indicate connections to the ADALM2000 connector. Setup waveform generator 1 for a 2.5 volt amplitude ​( 5 V p-p ) and with an offset of -1 volt such that  it swings from 1.5 volts positive to -3.5 volts negative for the case of a single cell. For two cells in series adjust the offset such that the maximum positive swing is 3 volts or twice the single battery voltage. Measure the open-circuit voltage ( when current through the 100 ohm resistor is zero ) and the drop in voltage across the battery ( scope C1 ) vs. current ( scope C2 /100 ) and determine the Thevenin equivalent resistance. Note that if the holder contains two cells in series, your answer will be twice the internal resistance of a single cell. + For this circuit you should have one or more batteries ( AA or AAA ) and a holder for them. Insert the batteries in the holder and add an external 100Ω resistance in series with the batteries as shown in figure 2. The green boxes indicate connections to the ADALM2000 connector. Setup waveform generator 1 for a 5 volt amplitude and with an offset of -1 volt such that  it swings from 1.5 volts positive to -3.5 volts negative for the case of a single cell. For two cells in series adjust the offset such that the maximum positive swing is 3 volts or twice the single battery voltage. Measure the open-circuit voltage ( when current through the 100 ohm resistor is zero ) and the drop in voltage across the battery ( scope C1 ) vs. current ( scope C2 /100 ) and determine the Thevenin equivalent resistance. Note that if the holder contains two cells in series, your answer will be twice the internal resistance of a single cell. {{ :​university:​courses:​electronics:​a0_f2.png?​400 |}} {{ :​university:​courses:​electronics:​a0_f2.png?​400 |}}