Procedure

Make clean and tight connections and Insert thermometer T1 and T2.

Connect constant level bath at one end of Callender and Barne’s calorimeter and adjust flow of water.

Connect Battery Eliminator to main socket carrying 230V ± 10% at 50Hz AC. Now switch on the battery Eliminator. The flow of water and strength of current by using potentiometer of Battery Eliminator should be so adjusted that a difference of temperature of about 10C between inlet and outlet is obtained.

Note down the values of V1 and I1 .

When the temperatures as shown by the thermometer remain steady for about 10 to 15 minutes, note the temperatures.

Collect flowing water for a known time by using Digital Stop Clock in a weighted beaker and find rate of flow of water.

Now alter the value of voltage & current and adjust again flow of water such that temperatures as shown by thermometers reach steady state.

Note readings for V2, I2 and m2 as in previous set.

Finally switch off current and there after cut off water supply.

Calculate the value of “ J “ using Formula as discussed.