Temperature Dependence on Resistance
Description: A choke coil is connected to an ohmmeter to measure its resistance. When the choke coil is placed in liquid nitrogen, the resistance drops.
This demonstration is also available on JCE Solid State CD-Rom.
Source: Ellis, Art et. al. Teaching General Chemistry: A Material Science Companion<\u>
Year: 1993 Vol: N/A Page: 199
Keywords: Ohmmeter, Resistance, Choke coil, Liquid nitrogen
Rating: 
Hazard: Some
- Cryogenic burn hazard
- Asphyxiation hazard
Effectiveness: Average
- Good connection from demo to course material
- Secondary effects are seen by audience
- High reliability
- Time to results are low
- Results are observable with guidance
Difficulty: Medium
- Some intermediate steps to results
- Demos at non-standard conditions
- Use of display
Safety Precautions:
- Eye protection required
- Gloves required
- Cryogenic gloves required
- Perform in a well-ventilated area
- Perform on a thermally resistant surface
Class: Solid State Chemistry
Division: Material Science Chemistry
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