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# A2 /EXPT/THER/RON/FIONA

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### Transcript

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