Page 71 - The Basics IA by ETron Circuit Labs

Here’s What You’ll Need...R1R2R3LED 1Cathode (flat side)B1RESISTORhole 12jhole 21j1K $ (Brown, Black, Red, Gold) hole 12fhole 12d1K $ (Brown, Black, Red, Gold) hole 12ahole 25a1K $ (Brown, Black, Red, Gold) Anode CathodeLIGHT EMITTING DIODE(LED)hole 21hhole 22hREDBLACKred = hole 25e black = hole 22f0 MA2 plus Resistor 3. Remove the battery and measure the resistance with an ohmmeter.RTotal = R1 + R2 + R3 .RNProcedure:Assemble the circuit and connect a 9-volt battery to the Battery Snap and observe the brightness of the LED. If you short a resistor, the LED will get brighter. Take a wire and touch the wire to the ends of resistor R1 to short it and you will observe the LED get brighter.Observations:By completing this Lab you have seen that the LED gets brighter when there is less resistance. You’ve demonstrated resistors in series add resistance to the circuit.Ohm’s Law as applied to resistors in series. E = I x (R1 + R2 + R3)The more resistors in series, the more total resistance in the circuit and the less current that will flow.Try this - remove the battery from the circuit, and with a multimeter, measure the total resistance of the 3 resistors in series. You will see that the total resistance is the sum of the 3 resistances, or approximately 3K Ohms.SCAN HERE TO SEE MORE ONLINE69AnodeLAB 35Visit us online at www.ETronCircuit.com for more exciting projectsLab Observations