UBC PHAS Demonstration Room Catalog

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====== Sagging Wire ======

{{tag> lost thermodynamics thermal_expansion joule_heating unlocated}}

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===== Description =====

Displays current-created heat and its thermal effect on a wire

Current flow 
Power from electricity (P = V*V/R) 
Heat expansion 

===== Purpose =====


To demonstrate current-created heat and it's thermal effect on a wire



===== Apparatus =====


  * Nickel wire (currently missing) 
  * 200g weight
  * Power supply with two leads
  * Two stands  



===== Setup =====


  - Tie the nickel wire between the two stands at a considerable distance (The longer the distance, the more sagging will occur 
  - Place the weight in the center of the span 
  - Attach the alligator clips of the leads to the ends of the wire 
  - Flick the power supply switch to 12 volts and turn the knob clockwise to its maximum 
  - The wire will start sagging to a maximum point 
  - Turn the power off and the wire will return to its original position  

===== Notes =====


If the wire is over heated, it will break. If the wire starts to glow red, it can break and possible ignite something.   
(

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| **Location** | ---- |
| **Maker** | Unknown |
| **Current State** | Working |
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