Physics II Lab w answers_Part_16

Physics II Lab w - of the oven is around the room temperature Heat the oven and measure the resistance of the thermistor in a regular time interval

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43 Experimental Set up: An electrical oven has been designed for this experiment. A heating element is wound a thin hard glass test tube. This test tube is thermally insulated from outer wall of the oven. This oven can heat the substances up to 110 ° C by passing appropriate amount of current. The thermistor resistance is measured using a Digital voltmeter (DVM). The schematic of the setup is shown in Fig. 2. Procedure: The thermistor and the thermometer put together in the oven and heat the oven by passing appropriate current through it. Measure the resistance of the thermistor from room temperature to about 80 ° C. Plot the graph for resistance Vs temperature.(Switch off the power supply immediately just after taking the readings). Now take the supplied chemical in a test tube with the thermistor and put it inside the oven (Make sure that initially inside
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Unformatted text preview: of the oven is around the room temperature). Heat the oven and measure the resistance of the thermistor in a regular time interval beyond the melting point(as you know during melting resistance of the thermistor will be remain almost constant) Analysis: Plot the resistance Versus time. Calculate the melting point of the given sample using the characteristics shown in fig. 1. Observations: Calibration of thermistor : S. No. Temperature ( o C) Resistance ( Ω ) 1 RT (25) 2 30 3 35 4 40 5 45 6 50 7 55 … … …. … …. … S. No. Time (sec) Resistance ( Ω ) 1 0 2 10 3 20 4 30 5 40 6 50 7 60 … … …. … …. … 44 Analysis: Plot two graphs and find the melting point (temperature) from the flat region of the 2 nd graph graph. Results: Melting point of the given solid is = …… o C (Two graph papers required)....
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This note was uploaded on 11/26/2011 for the course PHY 2053 taught by Professor Lind during the Fall '09 term at FSU.

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Physics II Lab w - of the oven is around the room temperature Heat the oven and measure the resistance of the thermistor in a regular time interval

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