Page 27 - The Basics IA by ETron Circuit Labs

Notice that electrons did not flow until the switch was pressed. There must be Base-Emitter current before any current will flow in the Collector-Emitter circuit.This act of a smaller current controlling a larger current is referred to as amplification. Within limits, as you increase the current in the Base-Emitter circuit, it will increase the current flowing in the collector-emitter circuit. By adjusting the value of R1, you may use an ammeter to observe the change in currents.Procedure:Assemble the circuit and connect a 9-volt battery to the Battery Snap and press the pushbutton switch to cause current to flow. Both LEDs should light up. When you release the pushbutton switch, both LEDs should turn off.Observations:By doing this experiment, you have seen that LED 2 in the Collector-Emitter circuit is brighter than LED 1 in the Base-Emitter circuit, and that both LEDs light up only after the pushbutton is pressed.Conclusion:You can conclude that the PNP Transistor can work as a current amplifier, sending more current through LED 2 than LED 1.Check Your Work Here a b c d e 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 a b c d e f g h i j 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 f g h i j Here’s What You’ll Need...R2R1Q1RESISTORhole 14ahole 23a220 Ohm - (Red, Red, Brown, Gold)hole 12dhole 23d3.3K % (Orange, Orange, Red, Gold) e cPNP TRANSISTORPNP 2N3906Emitter hole 3cBase Collector hole 4c hole 5cbPUSHBUTTONhole 10e S1 hole 12eAnode CathodeLIGHT EMITTING DIODE (LED)LED 1Cathode (flat side)LED 2Cathode (flat side)hole 4e hole 6e hole 13c hole 14cREDBLACKB1WIRESW1 = 3e & 20j W2 = 6c & 10dW3 = 5a & 13ared = hole 20f black = hole 23eSCAN HERE TO SEE MORE ONLINE25LAB 13Anode AnodeVisit us online at www.ETronCircuit.com for more exciting projectsLab Observations