Basic Idea:

• Find the cause of the systematic error from the previous experiment (Ohm's Law)

• 7

	What:	How Many:	Where:
This experiment uses the same equipment as Ohm's Law, except for the power supply Ask Jeff which power supplies to use
	DC regulated power supply	1 – 30v dual supply (preferred) or 2 – 30v single supplies	Majors storeroom, shelf C2
	Digital Multimeter	2	Majors storeroom, locked in steel cabinet
	Two resistor's mounted on board	1	non-Majors storeroom, shelf P3
	Wires	4 – 24" 1 – 12" (1 additional 12" wire will be needed if two single power supplies are connected in series!)	Bewkes 231 (Phys 152 Lab)
	Digital Multimeter – extras on instructor's bench	2	Majors storeroom, locked in steel cabinet
The equipment below is used for the instructor demo See Instructor notes
	Carbon resistor & wire coil	1 each	non-Majors storeroom, shelf P3 (in the same box as the mounted resistors)
	Liquid Nitrogen	A small dewer full	Will be obtained by instructor
	Digital Multimeter	1	Majors storeroom, locked in steel cabinet
	Wires	2 – 24"	Bewkes 231 (Phys 152 Lab)
	Alligator clips	2	Majors storeroom, shelf B2

Notes:

• Lab setup (photo details):
  • Note: The setup is essentially the same as Ohm's Law, except for the use of a dual power supply, and the addition of an instructor demo.
  • Note to Jeff: Use thermometer 'gun' (locked in metal cabinet) to measure hot resistor temperature!

©	St. Lawrence University	Department of Physics

Revised: 07 Mar 22

Canton, NY 13617