Record your data and the answers to questions on a separate sheet (or sheets) of paper and hand it in at recitation section when the lab is due. You will also have to bring your breadboard with designated circuits on it to your recitation section the week the lab is due.Procedure 1Procedure 2Procedure 3Procedure 4EE215, Laboratory 2 Page 1Extended DC Circuit AnalysisDue: At recitation the week of April 23-27ObjectivesAt the end of this lab, you will be able to:- construct, analyze and measure multiple-source circuits- model diodes as independent sources, and confirm the model with measurements- model transistors as dependent sources, and confirm the model with measurements- observe the effects of switching on resistive circuitsMaterials and SuppliesYou will need the materials you obtained for Lab 1 (multimeter, breadboard, jumper wire kit, parts kit, 9V battery), and you will have to buy or obtain an ordinary 1.5 V AAA battery, available at grocery stores, drugstores, the bookstore, etc.Parts for This LabFor parts (or, types of parts, like resistors) that you have already used in lab 1, you should be able to pick the parts out from the circuit diagram and find them in your part kit. This section will discuss parts you have not worked with yet. These are:- Red or Green Light Emitting Diode (LED)- Bipolar Junction Transistor (BJT), NPN, 2N3904- 1.5 V AAA battery connectorand they are all in the parts kit.Light Emitting Diodes or LEDs are the clear plastic bullet-shaped parts with two parallel leads sticking out. It should be obvious which is red and which is green. The clear part with the same shape is actually the phototransistor, not an LED.The transistor is the small black plastic part with three leads coming out. The case is shaped like a cylinder with one side shaved flat. If you look closely you can find its model number, 2N3904, printed on the flat side.The 1.5 V battery connector is pretty obvious, it is a sort of black plastic trough that the AAA battery fits into. It is marked UM-4 1.5V. As with the 9V battery connector, the red lead is positive. (Hmm, is there a pattern emerging here?) You can put the battery in backwards if you try - don't.Laboratory Procedures, Measurements, and QuestionsRecord your data and the answers to questions on a separate sheet (or sheets) of paper and hand it in at recitation section when the lab is due. You will also have to bring your breadboard with designated circuits on it to your recitation section the week the lab is due.Procedure 1Construct the Procedure 1 circuit on your breadboard:a. Calculate the voltage v across the 20k ohm resistor using node voltage analysis.b. Calculate the current i through the 20k ohm resistor using mesh current analysis.D. Wilson (1/14/19)R..D. Christie 4/9/01EE215, Laboratory 2 Page 2c. Measure the voltage v acrossthe 20k ohm resistor. Is itdifferent from what youcalculated in part a? Explain why or why not.d. Measure the current i throughthe 20k ohm resistor. Is itdifferent from what youcalculated in part b? Explain why or why not.Procedure 2Construct the Procedure 2 circuit leaving out the potentiometer (you'll add it later). Use either thered or green Light Emitting Diode(LED). The arrow is the symbolfor a diode (in this case, for theLED). The head of the arrow is theshort lead and the tail of the arrow corresponds to the long lead. Theflat on the rim of the LED casecorresponds to the bar in front ofthe arrow on the diode symbol.a. Is the LED lit?b. Reverse the polarity of thebattery. (Most convenient byunsnapping the battery andmaking momentary contact with the opposite terminals on the battery connector.) Is the LED lit?c. Return the battery to its initial polarity and reverse the direction of the LED. Is the LED lit?d. What can you say about the function of the LED? When does it conduct current?e. Choose a polarity for the battery and LED where the LED lights. Add the potentiometer to the circuit. Adjust the potentiometer to the point where the LED just turns on (illuminates); you will see an obvious jump in illumination from very dim to fairly bright. Measure the voltage across the LED at this point; this voltage is called the threshold voltage of the LED.f. Draw the circuit you used in part e. In your drawing, model (replace) the LED as an independent voltage source whose voltage value is equal to the threshold voltage you measured. Calculate the current through the LED using this circuit model.g. Measure the voltage across the resistor in series with the LED in part e. Calculate the current through the resistor. What is the current through the LED? How does this value compare with what you calculated in part f?h. Bring this circuit to the recitation and show it to your instructor. You may have to show how you determined the turn on point.Procedure 3Construct the Procedure 3 circuit using the bipolar junction transistor (BJT).D. Wilson (1/14/19)R..D. Christie 4/9/019 V1.5 V-+-+10 K10 K8.2 K20 KProcedure 1 Circuitvi-+9 V-+1.5 K30 Procedure 2 Circuit1 KpotEE215, Laboratory 2 Page 310k 8.2K 20 K20k9VBipolar JunctionTransistor (BJT)This pin is the EmitterEmitter PinBase PinThis pin is the BaseCollectorTop View of BJTR1R2Procedure 3 Circuita. Measure the voltage across the 20k resistor marked R1. Calculate the current through R1 from this measurement.b. Measure the voltage across the 10k resistor marked R2. Calculate the current through R2 from this measurement.c. How much larger is the current in R2 as compared to the current in R1?d. What kinds of dependent source could you use to model the transistor in the circuit drawing? Why does part e tell you to use a CCCS?e. Redraw the circuit replacing the transistor with a CCCS. Set the gain of the CCCS from part c. Use mesh current or node voltage analysis to calculate the current through R2. (Hint: replace the BJT symbol with the CCCS connected between R2 and the negative terminal of the battery. Replace the connection between the right side of R1 and the negative terminal of the battery with a 400 ohm resistorwhich models the input resistance of the BJT.)Procedure 4Construct the Procedure 4 circuit:a. Calculate the current through the 9V battery when the switch is in position A using node voltage or mesh current analysis. Measure the current through the 8.2k resistor that is in series with the 9 volt battery. How is this measured current different from your calculated current?b. Calculate the current through the 9V