A resistance thermometer which measures temperature by measuring the change in r

Question

A resistance thermometer which measures temperature by measuring the change in resistance of a conductor, is made of platinum and has a resistance of 50.0 ohms at 20.0 degrees Celsius. a) When the device is immersed in a vessel containing melting indium, its resistance increases to 76.8 ohms. From this information, find the melting point of indium. b) The indium is heated further until it reaches a temperature of 235 degrees Celsius. What is the new current in the platinum to the current IMP at the melting point?

Explanation / Answer

Solution: Using a=3.92x10-3(oC)-1 from table 17.1. Ro=50.0 W. To=20oC. R=76.8 W. 17.7 Electrical energy and power

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