MEASUREMENT OF SHC BY ELECTRICAL METHOD
TITLE:
MEASUREMENT OF SPECIFIC HEAT CAPACITY OF WATER BY ELECTRICAL METHOD
APPARATUS:
Well-lagged copper calorimeter C, sensitive thermometer T, copper stirrer S, heating coil H, voltmeter V, ammeter bA, rheostat R, 12 – VDC Power supply B, switch, stopwatch (or students watch).
METHOD:
The circuit was connected as shown in the diagram including rheostat R of a suitable resistance.
Weigh the empty calorimeter and stirrer and then with sufficient water added to cover the heating coil completely. The current was switched on and the value of the current checked to he suitable (about 2A). This was done by varying R.
It was switched off and stirred well, then the initial temperature was taken. It was switched on again and the stopwatch was started.
The reading of the temperature every half minute was taken, it was continually stirred, and the current was kept constant using R; until the temperature rose about 10°C but not higher (CARE).
It was then switched off, but the temperature continued to be read every half minute until it fell several degrees.
The maximum temperature that was reached was recorded, the reading of the ammeter A and Voltmeter V was also recorded.
MEASUREMENT:
PRECAUTION OF MEASUREMENT OF SPECIFIC HEAT CAPACITY OF WATER BY ELECTRICAL METHOD:
1 . All measuring instruments used had good calibration in scale to prevent inaccurate readings
2 . The electrical components were in good condition to prevent faulty connections.
CONCLUSION:
Calorimeter correction was carried out by plotting a graph of temperature (°C) and time (min).
To find the correction to the maximum observed temperature; the section of the laboratory strip on cooling correction was consulted.
GRAPH
Conclusion
Calorimeter correction was carried out by plotting a graph of temperature against time.
To find the correction to the maximum, observed temperature, the section of the laboratory strip on cooling correction was consulted.
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