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Ohms Law

PHY 100


Students investigate Ohms Law while comparing the electrical properties of a resistor and a light bulb.


Name Location Quantity
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.

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Item modified on 2017-09-20 12:06:21 by preisingc1.