A2 /EXPT/THER/RON/FIONA

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A2 /EXPT/THER/RON/FIONA

  1. 1. To identify the specific lantent heat of water by electric method Ron & Fiona
  2. 4. Steps to Follow <ul><li>Weigh the mass of water, m </li></ul><ul><li>Put the glass of water into a heat insulator </li></ul><ul><li>Set up the circuit shown in the diagram </li></ul><ul><li>Measure the initial temperature of water, T 1 </li></ul><ul><li>Read the current from the ammetre, I. And we know the votlage of the battery, V. </li></ul><ul><li>Switch on. Record the time taken to every 10 degrees rise in temperature of water. Record the times t 1 , t 2 , t 3 , etc. </li></ul>
  3. 5. c 3 t 3 c 2 t 2 c 1 t 1 c 5 t 5 c 4 t 4 The specific heat capacity of water (Jkg -1 K -1 ) Time taken to rise 10 o C in Temperature of water
  4. 6. Analysis of data <ul><li>Total energy used: E=VIt </li></ul><ul><li>From E=cm△t </li></ul><ul><li>we can get cm△t=VIt </li></ul><ul><li>Here △t=10 </li></ul><ul><li>Therefore, c = VIt / 10m </li></ul><ul><li>Then we get c 1 , c 2 , c 3 … from t 1 , t 2 , t 3 … </li></ul><ul><li>Now take the average. </li></ul>
  5. 7. Safety precausions <ul><li>Do not raise the temperature of water to too high, i.e. boiling point. </li></ul><ul><li>Do not touch the wet wires and resistor. </li></ul>
  6. 8. <ul><li>Random error: </li></ul><ul><li>- heat loss when heating </li></ul><ul><li>- errors when reading the thermometre </li></ul><ul><li>Improvements: </li></ul><ul><li>- use an insulator that fit the glass so that there is as little air as possible in the insulator </li></ul><ul><li>- do more times to take average (exactly what we have done) </li></ul>

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