### 3.5.2012

 ELECTRONICS II  TRANSISTORS Revisited: The bipolar transistor comes in two varieties: THE PNP and NPN Essentially the transistor is two PN junctions put together. The BASE controls the flow of current through the emitter collector The transistor can switch things on and off or it can amplify input signals.   Review the information sheet, summarize and put on your website. SEND LINK TO SORENSON   Do a lab from the trainers that utilizes a transistor and CAREFULLY measure the following while the lab is operating:   VBE VBC VEC   Identify the resistors in series with the base, emitter, and collector.  Calculate voltage drop across those resistors. NOTE:  Silicon transistors have a bias voltage of approximately .6 Volts FWD BIAS Germanium transistors have a bias voltage of approximately .2 Volts FWD BIAS     When you finish the lab, place the results in you website.     Electronics I, Ohm's law again,   Using the trainers wire up a basic DC circuit using 9 volts from the power supply and three low value resistors.   Calculate total Resistance by adding them up.  Calculate total current by dividing 9 volts by total Resistance.    Use ohms law to calculate how much of the 9 volts goes away at each resistor.  VR1 =  IR1 x  R1