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Experiment: To Verify Joules LawNote: Also investigates the factors which affect the amount of heat produced.69532571437500Apparatus: Calorimeter (with cover if available), insulating material, water, heating coil, thermometer (digital if available), variable resistor, stopwatch, graduated cylinderDiagram:Method:Fill the calorimeter with enough cold water to completely cover, the heating coil and then transfer the water into an empty graduated cylinder and note its volume. Transfer water back into the calorimeter.Set up the equipment as shown in the diagramTurn on the current and adjust the variable resistor until 0.5 A flows. Turn off the current, stir water and wait a minute or two for water to cool.Record initial temperature, θ1.Turn on the current and record the current value (I) on the ammeter. Allow the current to flow for a set time (5 mins), stirring regularly.Ensure that current remains at the initial value by adjusting the variable resistor.Record the final temperature θ2.Empty the warm water and refill with an equal volume of cold water.Increase the current value and repeat, ensuring that the same volume of cold water is used each time and that the time interval remains the plete the table belowResults:Θ1(0C)Θ2 (0C)Δθ (0C)I (A)0.51.01.52.02.53.0I2(A2)Conclusions:A graph of our results produced a straight-line through the origin thus verifying that Δθ α I2 and therefore verifies Joule’s law. Precautions:Put sufficient water in the calorimeter to cover the heating coil.Take care not to exceed the current-rating marked on the rheostat and/or the calorimeter. ................
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