Students investigate Ohms Law while comparing the electrical properties of a resistor and a light bulb.
|Bulbs, Miniature, Bayonet base||JE-105A-S135||1 per table|
|Clips, Alligator||JE-105A-S58||2 per table|
|Multimeter, Digital, Extech EX420 - Battery||JE-105A-D103||1 per table|
|Wire, Banana Patch Cords, Hookup Leads||JE-Lab Rooms-ByChalkboard||2 per table|
|Power Supply, Extech (Model #382213)||JE-105A-X12/13||1 per table|
|Resistor, 150 ohms||JE-105A-S157||1 per table|
|Ruler, Transparent, Flexible||JE-105A-D90||3 per table|
|Wire, Nichrome, Nickel Cromium, 22GA||JE-105A-S69||1 per room|
Place 1 red and 1 black banana cord in power supply with voltage at zero and current at max. Make sure the power supply is off and unplugged and the multimeters are off.Feinstock clips on each end of the resistor.
Put on the teacher table a spool of nichrome wire along with any previously used cut pieces of nichrome that are about 2 feet long. Set current limiting on power supplies to allow no more than 400 mA and then remove current knobs. (Keep knobs in safe place for re-installation when power supplies are returned to the stock room. The indicator dot on the knob normally rotates clockwise from 7 o'clock to 5 o'clock.)
Along with the initial apparatus set-up, supply a sufficient number of the appropriate paper procedure handouts for all of the lab sections that will use the set-up over the course of the week. Print the PDF, duplicate to double-sided pages, staple, and leave pile on instructor's table prior to first use of set-up.