Based on Loyd #31. In this experiment, students will take measurements of circuits with galvanometers. From the measurements, the students will determine the internal resistance of the galvanometer, the current sensitivity. The students will also turn the galvanometer into a voltmeter by putting it in series with the correct resistance and into an ammeter by putting it in parallel with the correct resistance.
|Galvanometer||JE-105A-S46||1 per table|
|Power Supply, Extech (Model #382213)||JE-105A-X12/13||1 per table|
|Resistors, 330 Ohms||JE-105A -X40||1 per table|
|Multimeter, Digital, Sperry DM5300 - Battery||JE-105A- D101||2 per table|
|Resistance, Decade Box (Central Scientific Co. Cat||JE-105A-S51||1 per table|
|Wire, Banana Patch Cords, Hookup Leads||JE-Lab Rooms-ByChalkboard||4 per table|
|Tools, Wire Cutter||JE-105A-Toolbox S8||1 per room|
|Clips, Alligator||JE-105A-S58||4 per table|
Use the center screw to zero all galvanometers before the lab. Also be sure to test the multimeters and power supplies. Put out the Extech power supplies. If there are not enough, use the Sargent-Welch power supplies. The Loyd lab manual calls for resistance boxes between 2500 and 3500 ohms. Make sure that the resistance boxes put out have that range.
Have available a spool of #28 copper wire (located on S69) and wire cutters. Because of their size, the resistors should be kept on the instructor's table.