Homework Help Forum: Heat & Properties of Matter

Posted by Beta plus on Friday, October 16, 2009 at 4:28am.

A platinum resistance thermometer has a resistance of 10.59ohms at 0 degree celcius and 15.59ohms at 100 degree celcius. Assuming that the resistance changes uniformly with temperature, what is: (i) the temperature when the resistance is 10.59ohms? (ii) the resistance of the thermometer when the temperature is 55degree celcius?

• Heat & Properties of Matter - Dr Russ, Friday, October 16, 2009 at 4:45am

  i) is easy as that is in the question and is a prompt for the next part: As we are told that response is linear the equation for the resistance will be of the form y=mx+c or R=mT+c if you like we are told c in the question (c=10.59 ohms) to calculate m m=(15.59-10.59)ohms/100 C = 0.0500 ohms/C so the equation is R=0.0500T+10.59 Now substitute 55 deg C and calculate R

  
  

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