ࡱ> yk 2bjbj 5}} l.......B8 B2"&&&&&&       $ 1.&&&&&1..&&F&j.&.& & : ,.. & @Y#BH \0 Rpp BB.... Spreadsheet Assignment 1 Data Analysis: Thermistor A circuit contains a thermistor and a resistor connected in series with a power supply of emf E volt and zero internal resistance. (see diagram below).  EMBED SmartDraw.2  The thermistor can be placed in an environment (e.g. sand ) where its temperature can be changed. The thermistors electrical resistance changes with temperature in a non linear manner. The actual values of the resistance for different temperatures are found in dataAnalysisA2.xls found on the CD and at the website. A screen dump of the excel spreadsheet is given on the next page. Please note that the second sheet (copy of data) is a backup copy of the resistance vs temperature values. This copy is given in case you lose the original data. Note the following: Cell D4 contains the value of the emf, E of the power supply. When using it in formulae you would be advised to address it as $D$4 so that any scrolling of data always keeps an absolute reference to that cell. Cell J4 maintains the value of the electrical resistor R. Again you are better advised to reference this cell absolutely in any formula (i.e. $J$4 ). Columns B and C contain the data for thermistors electrical resistance and its temperature (in oC ) Three columns are left blank for you to fill (columns E, F and G).  Activities: Write down a formula for the total current, I, flowing through the components using E, R and RT. Use this formula to complete column E. For E, R and RT use the appropriate cell references, remember that RT is changing and you will need to be using values from column B. Write down a formula that will calculate the p.d. across the thermistor for each temperature, using I and RT. Use this formula to complete the entries for column F. Write down a formula that will calculate the power dissipated by the thermistor at each temperature using I and V. Use this formula to complete the entries for column G. Produce a graph/chart that has temperature (on the x-axis) and Power (on the y-axis). Describe the shape of this graph as fully as you can using quantitative data as well as simple description. Produce a second graph which has power (on the y-axis) and electrical resistance of the thermistor (on the x-axis). Alter the values of E (in cell D4) and comment upon how the graphs change. Keeping the value of E constant, alter the value of R. Comment upon how the graphs are altered as R changes. Produce screen dumps of your results along with any comments you wish to make concerning the maximum power and the value of R. PAGE  PAGE 2 569 : > J    !#$*+,-.20JmHnHu0J j0JUH*56>*CJ\] jUH*j1"? UVmH sH  jUCJ $5678*+&'7 8 9 ; < = > J  & F1J K Z k * !"#./012 hh]h`h&`#$ & F3 0&P 1h. 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